# Items where Subject is "Natural Sciences > Mathematics"

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- APF focus areas (342)
- Natural Sciences (342)
**Mathematics**(342)

- Natural Sciences (342)

**334**.

## (

(CoMaC), COMMUNITY MATHEMATICS CENTRE
(2014)
*Enumeration of semi-regular tessellations.*
At Right Angles, 3 (1).
pp. 12-14.

(CoMaC), Community Mathematics Centre
(2017)
*3 4 5... strikes again!*
At Right Angles, 6 (1).
pp. 48-49.

(CoMaC), Community Mathematics Centre
(2019)
*Can there be SSA congruence?*
At Right Angles (4).
pp. 66-69.

(CoMaC), Community Mathematics Centre
(2019)
*Computing an angle in an equilateral triangle.*
At Right Angles (4).
pp. 102-103.

(CoMaC), Community Mathematics Centre
(2017)
*Two problem studies.*
At Right Angles, 6 (1).
pp. 76-79.

(CoMaC), Community Mathematics Centre
(2017)
*What’s the
next number?*
At Right Angles, 6 (2).
pp. 54-56.

## ,

, CoMaC
(2012)
*How many primitive Pythagorean triples in arithmetic progression.*
At Right Angles, 1 (1).
pp. 33-34.

, CoMac
(2012)
*Complete family of pythagorean triples.*
At Right Angles, 1 (2).
pp. 27-30.

, CoMac
(2013)
*Fun problems.*
At Right Angles, 2 (1).
pp. 49-52.

, CoMac
(2013)
*In his own words: George Polya.*
At Right Angles, 2 (1).
pp. 30-34.

, CoMac
(2012)
*Ramanujan and pythagoras!*
At Right Angles, 1 (2).
pp. 41-42.

, CoMac
(2013)
*An application of graphs centigrade–fahrenheit conversion.*
At Right Angles, 2 (1).
pp. 41-43.

, CoMac
(2013)
*A plethora: One problem, six Solutions.*
At Right Angles, 2 (1).
pp. 35-38.

, CoMac
(2018)
*A pythagoras-style diophantine equation and its Solution.*
At Right Angles, 7 (3).
pp. 101-012.

, CoMαC
(2012)
*One formula - two derivations.*
At Right Angles, 1 (1).
pp. 35-38.

, Crux Mathematicorum
(2012)
*Problems, the life blood of mathematics.*
At Right Anlges, 1 (1).
pp. 65-66.

## A

A S, Shailesh
(2013)
*How To Prove It.*
: At Right Angles, 2 (3).

A., Ramachandran
(2019)
*Middle school problems on averages.*
At Right Angles (5).
pp. 74-76.
ISSN 2582-1873

AWASTHI, KHUSHBOO
(2017)
*Drawing A SPIRAL OF SQUARE ROOTS.*
At Right Angles, 6 (1).
pp. 39-45.

Acheson, David
(2018)
*1089 and all that: a journey into mathematics.*
At Right Angles, 7 (3).
pp. 106-108.

Agadeeshan, Shashidhar J.
(2019)
*From regular pentagons to the icosahedron and dodecahedron via the golden ratio – ii.*
At Right Angles (5).
pp. 17-26.
ISSN 2582-1873

Anand, Aradhana
(2018)
*Creating trigonometric tables.*
At Right Angles, 7 (2).
pp. 5-9.

Athle, Ajit.
(2014)
*Solve a geometry problem — III.*
At Right Angles, 3 (3).
pp. 75-77.

Athmaraman, R.
(2012)
*Open-ended questions.*
At Right Angles, 1 (2).
pp. 37-40.

Athmaraman, R.
(2013)
*Problems for the
Middle School.*
At Right Angles, 2 (3).
pp. 1-3.

Athmaraman, R.
(2012)
*Problems for the middle school.*
At Right Angles, 1 (2).
pp. 67-69.

Athmaraman, R.
(2015)
*Problems for the middle school.*
At Right Angles, 4 (3).
pp. 88-91.

Athmaraman, R.
(2014)
*Problems for the middle school.*
At Right Angles, 3 (3).
pp. 78-79.

Athmaraman, R.
(2013)
*Problems for the middle school.*
At Right Angles, 2 (1).
pp. 53-55.

Azim Premji University, (APU)
(2019)
*A very brief introduction to fractals.*
At Right Angles (4).
p. 1.

## B

B, Sury
(2013)
*Set theory revisited as easy as pie
the principle of inclusion and exclusion – part 1.*
At RIght Angle, 2 (1).
pp. 16-19.

BIZONY, MARCUS
(2016)
*The 3-4-5 triangle: some observations.*
At Right Angles, 5 (3).
pp. 12-15.

BIZONY, MARCUS
(2017)
*THE GOLDEN RATIO Unexpectedly.*
At Right Angles, 6 (1).
pp. 29-31.

Badiger, Arvind N.
(2012)
*Generating PPTs-letter received from the reader.*
At Right Angles, 1 (2).
p. 1.

Basu, Madhushree and Prasad, Amritanshu and Ravikumar, Vijay
(2018)
*Triangular numbers.*
At Right Angles, 7 (1).
pp. 5-12.

Bhaduri, Ananda
(2019)
*Circles inscribed in segments.*
At Right Angles (4).
pp. 22-26.

Bhatnagar, Gaurav
(2017)
*How to discover the exponential function x e.*
At Right Angles, 6 (3).
09-13.

Bhatt, Meghraj
(2019)
*Simple cryptography.*
At Right Angles (5).
pp. 29-31.
ISSN 2582-1873

Bizony, Marcus
(2016)
*Three means.*
At Right Angles, 5 (2).
pp. 50-53.

## C

CENTRE, COMMUNITY MATHEMATICS
(2018)
*Characterisation of a
right triangle.*
At Right Angles, 7 (2).
pp. 91-94.

CENTRE, COMMUNITY MATHEMATICS
(2018)
*Problem about a
finite sequence.*
At RIght Angles, 7 (2).
pp. 137-139.

CENTRE, COMMUNITY MATHEMATICS
(2018)
*The three circles
problem.*
At Right Angles, 7 (2).
pp. 134-136.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2018)
*Area covered by two intersecting circles.*
At Right Angles, 7 (3).
pp. 59-62.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2015)
*Generating the n-th Prime.*
At Right Angles, 4 (2).
pp. 28-29.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2017)
*Problem concerning
rational numbers.*
At Right Angles, 6 (2).
pp. 98-102.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2017)
*Theorem concerning a
right triangle.*
At Right Angles, 6 (2).
pp. 95-97.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2015)
*A baby one quarter the size of its parents.*
At Right Angles, 4 (2).
pp. 40-43.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2015)
*A flower with four petals.*
At Right Angles, 4 (2).
pp. 26-27.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2015)
*A potpourri of problems.*
At Right Angles, 4 (2).
pp. 55-58.

COMMUNITY MATHEMATICS CENTRE, CoMaC
(2012)
*The pythagorean theorem.*
At Right Angles, 1 (1).
pp. 20-24.

CoMaC, COMMUNITY MATHEMATICS CENTRE
(2015)
*Investigations.*
At Right Angles, 4 (3).
pp. 58-61.

CoMaC, COMMUNITY MATHEMATICS CENTRE
(2015)
*Two problems.*
At Right Angles, 4 (3).
pp. 83-87.

CoMaC, CoMac
(2013)
*A Tale of Two
Formulas.*
At Right Angles, 2 (3).
pp. 1-4.

CoMaC, The COMMUNITY MATHEMATICS CENTRE (
(2012)
*Ramanujan numbers.*
At Right Angles, 1 (2).
pp. 61-62.

CoMaC, The COMMUNITY MATHEMATICS CENTRE (
(2017)
*A Simpler way to Bisect an Angle.*
At Right Angles, 6 (1).
p. 47.

Comac, Comac
(2017)
*There are infinitely prime numbers.*
At Right Angles, 6 (3).
pp. 26-27.

Comac, Comac
(2017)
*What to do when one gets two different answers to a counting problems.*
At Right Angles, 6 (3).
pp. 64-66.

Comac, Comac
(2017)
*A triangle problem.*
At Right Angles, 6 (3).
pp. 96-98.

Community Mathematics Centre, (CoMaC)
(2014)
*Two combinatorial problems.*
At Right Angles, 3 (3).
pp. 70-72.

Community Mathematics Centre, (CoMaC)
(2014)
*A nines multiples problem.*
At Right Angles, 3 (3).
pp. 73-74.

Costa, Agnes D
(2012)
*Exploring constructivism.*
At Right Angles, 1 (2).
pp. 1-2.

center, Community mathematic
(2018)
*An angle-in-a-
quadrilateral problem.*
At Right Angles, 7 (2).
pp. 101-104.

## D

D E, PRITHWIJIT and SHIRALI, SHAILESH
(2016)
*Problems for the Senior School.*
At Right Angles, 5 (2).
pp. 77-80.

DAS, SHUBORNO
(2018)
*Functional
equations.*
At Right Angles, 7 (2).
pp. 10-18.

DE, PRITHWIJIT
(2018)
*The Odd-even
tale.*
At Right Angles, 7 (2).
pp. 126-129.

DE, PRITHWIJIT
(2018)
*On an optimization problem.*
At Right Angles, 7 (1).
pp. 80-82.

DE, PRITHWIJIT
(2017)
*On problem posing.*
At Right Angles, 6 (2).
pp. 82-85.

DE VILLIERS, M
(2013)
*A Trapezium
Theorem
Generalized.*
At Right Angles, 2 (3).
pp. 1-4.

DE VILLIERS, MICHAEL
(2017)
*An example of constructive defining:
from a golden
rectangle to golden
QUADRILATERALS
and beyond.*
At Right Angles, 6 (2).
pp. 74-81.

DE VILLIERS, MICHAEL.
(2015)
*Flashback to the past a 1949 matric geometry question.*
At Right Angles, 4 (3).
pp. 24-29.

DESAI, RANJIT
(2016)
*Adventures with triples.*
At Right Angles, 5 (2).
pp. 91-93.

De, P and Shirali, S
(2013)
*Problems For The Middle School.*
At Right Angles, 2 (3).
pp. 1-2.
(Submitted)

De, Prithiwijit and Shirali, Shailesh
(2017)
*Problems for senior school.*
At Right Angles, 6 (3).
pp. 104-107.

De, Prithiwijit and Sircar, Swati and Titus, Sneha
(2017)
*APC-AREA, perimeter and congruency.*
At Right Angles, 6 (3).
pp. 55-58.

De, Prithwijit
(2018)
*Pigeonhole principle: some applications.*
At Right Angles, 7 (3).
pp. 74-78.

De, Prithwijit
(2016)
*An eye on eyeball.*
At Right Angles, 5 (2).
pp. 34-37.

De, Prithwijit
(2019)
*A geometric exploration.*
At Right Angles (4).
pp. 90-92.

De, Prithwijit
(2012)
*A sweet seller’s trick.*
At Right Angles, 1 (1).
pp. 17-19.

De, Prithwijit
(2017)
*A triangle problem and three variants.*
At Right Angles, 6 (3).
pp. 31-36.

De, Prithwijit and Shirali, Shailesh
(2018)
*Problems for the
senior school.*
At Right Angles, 7 (2).
pp. 123-125.

De, Prithwijit and Shirali, Shailesh
(2019)
*Problems for the Senior school.*
At Right Angles (4).
pp. 87-89.

De, Prithwijit and Shirali, Shailesh
(2017)
*Problems for the senior school.*
AT Right Angles, 6 (1).
pp. 73-75.

De, Prithwijit and Shirali, Shailesh
(2017)
*Problems for the senior school.*
At Right Angles, 6 (2).
pp. 92-94.

De, Prithwijit and Shirali, Shailesh
(2012)
*Problems for the senior school.*
At Right Angles, 1 (2).
pp. 70-73.

De, Prithwijit and Shirali, Shailesh
(2013)
*Problems for the senior school.*
At Right Angles, 2 (1).
pp. 56-59.

De, Prithwijit and Shirali, Shailesh
(2018)
*Problems for the senior school.*
At Right Angles, 7 (3).
pp. 103-105.

De, Prithwijit and Shirali, Shailesh
(2019)
*Problems for the senior school.*
At Right Angles (5).
pp. 77-80.
ISSN 2582-1873

De, Prithwijit and Shirali, Shailesh
(2018)
*Problems for the senior schools.*
At Right Angles, 7 (1).
pp. 117-119.

De, Prithwijit and Titus, Sneha and Sircar, Swati
(2014)
*Fair Division.*
At Right Angles, 3 (1).
pp. 31-34.

De, Prithwijit and Shirali, Shailesh
(2014)
*Problems for the senior school.*
At Right Angles, 3 (3).
pp. 80-81.

Dewan, Hriday Kant
(2018)
*Interpretation of errors in arithmetic.*
At Right Angles, 7 (3).
pp. 48-52.

## F

FITZHERBERT, ANUSHKA RAO
(2018)
*The conjecturing classroom.*
At Right Angles, 7 (1).
pp. 38-43.

## G

G. R., Veena
(2019)
*The gap between ‘HOW’ and ‘WHY’ in mathematics….*
At Right Angles (4).
p. 54.

GANDHI, DR. HANEET
(2017)
*Method in Mathness, CATALOGUING 1-UNIFORM TILINGS.*
At Right Angles, 6 (1).
pp. 15-20.

GHOSH, JONAKI
(2015)
*Hill ciphers.*
At Right Angles, 4 (3).
pp. 62-71.

GHOSH, JONAKI and ADSULE, ROHIT
(2018)
*The elementary cellular automata a journey into the computational world.*
At Right Angles, 7 (1).
pp. 95-104.

GHOSH, JONAKI B and ADSULE, ROHIT
(2018)
*One dimensional cellular automata-The totalistic
approach.*
At Right Angles, 7 (2).
pp. 105-116.

GOSWAMI, RICHA
(2018)
*Misconceptions in fraction.*
At Right Anglesa, 7 (1).
pp. 48-51.

Gandhi, Haneet
(2014)
*Covering the Plane with repeated patterns.*
At Right Angles, 3 (1).
pp. 5-11.

Garge, Anuradha S.
(2012)
*Tracing the history of a theorem Lagrange’s four squares theorem.*
At Right Angles, 1 (2).
pp. 5-9.

Gaur, S
(2013)
*An ‘Origamics’
Activity: X-lines.*
At Right Angles, 2 (3).
pp. 1-3.

Gaur, Shiv
(2012)
*How do you divide a strip into equal fifths?*
At Right Angles, 1 (1).
pp. 25-28.

Gaur, Shiv
(2013)
*Paper play making a skeletal dodecahedron
a solid geometry experience.*
At Right Angle, 2 (1).
pp. 5-10.

Gaur, Shiv
(2013)
*Paper play: Making a skeletal
dodecahedron.*
At Right Angles, 2 (1).
pp. 5-10.

Gaur, Shiv.
(2012)
*Axioms of paper folding.*
At Right Angles, 1 (2).
pp. 16-22.

Gesota, Rupesh
(2018)
*Making sense of adding unlike fractions.*
At Right Angles, 7 (2).
pp. 59-61.

Ghosh, Jonaki
(2012)
*The birthday paradox.*
At Right Angles, 1 (1).
pp. 39-42.

Ghosh, Jonaki
(2019)
*Exploring fractals : the geogebra way.*
At Right Angles (4).
pp. 77-83.

Ghosh, Jonaki B.
(2019)
*The game of craps.*
At Right Angles (5).
pp. 66-73.
ISSN 2582-1873

Ghosh, Jonaki B.
(2012)
*The monty hall problem.*
At Right Angles, 1 (2).
pp. 55-60.

Gonick, Larry
(2017)
*A review of
the cartoon guide
to Algebra and
the cartoon guide
to calculus.*
At Right Angles, 6 (2).
pp. 106-112.

Gowers, William Timothy
*How Craig Barton wishes he’d taught maths.*
At Right Angles (5).
pp. 83-88.
ISSN 2582-1873

Gulati, Sangeeta
(2017)
*Create your own interactive activity.*
At Right Angles, 6 (3).
pp. 81-88.

Gulati, Sangeeta
(2018)
*Mobile puzzles – making sense of variables and equations.*
At Right Angles, 7 (3).
pp. 63-68.

## J

JAGATHAPU, KASI RAO
(2018)
*Bisecting an angle
using a ruler.*
At Right Angles, 7 (2).
pp. 30-32.

JOARDAR, BODHIDEEP
(2017)
*A Property of Primitive
Pythagorean triples.*
At Right Angles, 6 (2).
pp. 67-68.

JOARDAR, BODHIDEEP
(2018)
*Solution of Ramanujan’s
door number problem by using
vargaprakriti.*
At Right Angles, 7 (1).
pp. 56-57.

JOSHI, PROF. KAPIL D
(2018)
*Visual proof of the two-variable am-gm inequality.*
At Right Angles, 7 (1).
pp. 54-55.

Jagadeeshan, Shashidhar
(2019)
*From regular pentagons to the icosahedron via the golden ratio - part I.*
At Right Angles (4).
pp. 5-9.

Jagadeeshan, Shashidhar
(2018)
*Introducing Steven Strogatz.*
At Right Angles, 7 (3).
pp. 109-110.

Jagadeeshan, Shashidhar
(2015)
*Review of "math! encounters with high school students" by serge lang.*
At Right Angles, 4 (3).
pp. 99-103.

Jagadeeshan, Shashidhar
(2013)
*Towards mathematical disposition
notes from a small school
supportive learning spaces.*
At Right Angles, 2 (1).
pp. 24-29.

Jagadeeshan, Shashidhar
(2016)
*The magical world of infinities.*
At Right Angles, 5 (2).
pp. 17-23.

Jagadeeshan, Shashidhar
(2012)
*The theorem of Pythagoras.*
At Right Angles, 1 (1).
pp. 5-13.

Jagadeeshan, Shashidhar
(2017)
*The story of maths : a brief review.*
At Right Angles, 6 (3).
pp. 117-118.

Jha, Shreyan
(2019)
*Explorations on triangles with integer sides.*
At Right Angles (5).
pp. 41-42.
ISSN 2582-1873

Joardar, Bodhideep
(2017)
*An Approximation of π by using the law of cosines.*
At Right Angles, 6 (3).
pp. 43-45.

Joshi, Kapil D
(2018)
*The power triangle.*
At Right Angles, 7 (1).
pp. 33-37.

## K

K, Subramaniam
(2016)
*Jill Adler – a South African mathematics education researcher.*
At Right Angles, 5 (2).
pp. 5-10.

K., SUBRAMANIAM
(2018)
*The conjoining error in school algebra.*
At Right Angles, 7 (1).
pp. 44-47.

Karmarkar, Bharat
(2014)
*Explorations in teaching.*
At Right Angles, 3 (1).
pp. 38-39.

Katkar, Laxman N.
(2019)
*Extensions of the theorem of Pythagoras.*
At Right Angles (5).
pp. 11-16.
ISSN 2582-1873

Kissane, Barry
(2016)
*Introducing Differential Calculus on a Graphics Calculator.*
At Right Angles, 5 (2).
pp. 68-76.

Kleiner, Mark
(2015)
*Edward Frenkel’s
“Love & Math:
the Heart of
Hidden Reality”
- a review.*
At Right Angles, 4 (1).
pp. 66-69.

Kodur, Giri
(2013)
*Slicing a cube sum of cubes and square of a sum
understanding your identity.*
At Right Angle, 2 (1).
pp. 11-15.

Kodur, Giri
(2013)
*Slicing a cube: Sum of cubes and square of a sum.*
At Right Angles, 2 (1).
pp. 11-15.

Korpal, Gaurish
(2015)
*Say crease! folding paper in half miles please.*
At Right Angles, 4 (3).
pp. 20-23.

Krishnamoorthy, Usha
(2019)
*Data, perception and ignorance.*
At Right Angles (4).
pp. 104-112.

Krishnaswamy, Rema and Biswas, Jishnu
(2018)
*Beautiful, simple, exact, crazy.*
At Right Angles, 7 (1).
pp. 124-127.

Kumar, Prabhat
(2016)
*Rich Maths for Everyone: A Review of Jo Boaler’s Mathematical
Mindsets.*
At Right Angles, 5 (2).
pp. 94-98.

## L

Lingefjard, Thomas and Farahani, Djamshid
(2017)
*Teaching concept of calculus.*
At Right Angles, 6 (3).
pp. 76-80.

## M

MUKHOPADHYAY, UTPAL
(2018)
*Ramanujan and some elementary
mathematical problems.*
Ar Right Angles, 7 (1).
pp. 13-21.

Magon, Ishaan and Reddy, Maya and Suresh, Rishabh and Jagadeeshan, Shashidhar
(2016)
*The rascal triangle A rascal full of surprises!*
At Right Angles, 5 (3).
pp. 16-20.

Manjunath, Amrutha
(2015)
*The methods of Archimedes.*
At Right Angles, 4 (3).
pp. 7-15.

Miraj, Rahil
(2019)
*Radii of in-circle and ex-circles of a right- angled triangle.*
At Right Angles (4).
pp. 27-30.

Mishra, P and Gaurav, B
(2013)
*Introducing
Ambigrams.*
At Right Angles, 2 (3).

Mishra, Punya
(2014)
*Introducing symmetry.*
At Right Angles, 3 (1).
pp. 25-30.

Mishra, Punya
(2013)
*The mathematical “i”.*
At Right Angles, 2 (1).
pp. 68-69.

Mishra, Punya and Bhatnagar, Gaurav
(2015)
*Paradoxes: Part 2 of 2.*
At Right Angles, 4 (2).
pp. 9-14.

Mukunda, Kamala
(2017)
*Knowing and teaching elementary mathematics.*
At Right Angles, 6 (1).
pp. 80-84.

Mukunda, Kamala.
(2012)
*Analyzing games of chance with math . . . fair game.*
At Right Angles, 1 (2).
pp. 10-15.

Mukunda, M
(2013)
*Book Reviews.*
At Right Angles, 2 (3).
pp. 1-9.

Murthy, M. Narasimha
(2019)
*Brahmagupta’s theorem.*
At Right Angles (5).
p. 27.
ISSN 2582-1873

## N

NAIR, VINAY
(2017)
*Divisibility by
Primes.*
At Right Angles, 6 (2).
pp. 63-66.

NAIR, VINAY
(2018)
*Fractional triplets.*
At Right Angles, 7 (1).
pp. 83-86.

Nair, Vinay
(2015)
*Algebracadabra magic squares ; with prime entries.*
At Right Angles, 4 (3).
pp. 16-19.

Nair, Vinay
(2019)
*A mathematical pilgrimage : Ramanujan yatra.*
At Right Angles (5).
pp. 5-10.
ISSN 2582-1873

Nandi, Avipsha
(2019)
*Orthocentre of a triangle and its distance from any point in the plane.*
At Right Angles (5).
pp. 58-65.
ISSN 2582-1873

Nityananda, Rajaram
(2014)
*Mathematics for the billion.*
Current Science, 107 (07).
pp. 1087-1088.
ISSN 0011-3891

Nityananda, Rajaram
(2014)
*Singularities in a teacup: good mathematics from bad lenses.*
Resonance: journal of science education, 19 (9).
ISSN 0973-712X

Nityananda, Rajaram
(2014)
*Vladimir Igorevich Arnold (1937–2010).*
Resonance: Journal of Science Education, 19 (9).
pp. 779-783.
ISSN 0973-712X

## O

OXMAN, VICTOR
(2017)
*Property associated with
the Orthocentre of a Triangle
PROPERTY ASSOCIATED WITH THE ORTHOCENTRE OF A
TRIANGLE
A PROOF
WITHOUT WORDS.*
At Right Angles, 6 (2).
pp. 75-76.

Orlin, Ben
(2013)
*A
Fight With
Euclid.*
At Right Angles, 2 (3).
pp. 1-5.

## P

PARTHIV, DEDASANIYA
(2017)
*An investigation with
TRIANGLES
& CIRCLES.*
At Right Angles, 6 (2).
pp. 69-72.

PATEL, TEJASH
(2018)
*Using coordinate geometry to find the GCD and LCM of two numbers a & b.*
At Eight Angles, 7 (1).
pp. 58-59.

Patil, Dev ChandanAdhiraj
(2017)
*Happy numbers.*
At Right Angles, 6 (3).
pp. 37-39.

Patil, Pratima
(2018)
*Mini review
numero friendly
board games.*
At Right Anlges, 7 (2).
pp. 143-145.

Patnaik, Rajkishore
(2013)
*Numberphile.*
At Right Angles, 2 (1).
p. 64.

Prakash, Anand
(2019)
*A modified pascal triangle.*
At Right Angles (5).
pp. 37-40.
ISSN 2582-1873

Prasad, Phoolan
(2018)
*Mathematics olympiads in India.*
At Right Angles, 7 (3).
pp. 85-91.

## R

R, ATHMARAMAN
(2015)
*Problems for the
Middle School.*
At Right Angles, 4 (1).
pp. 59-61.

R, ATHMARAMAN
(2016)
*Problems for the Middle School.*
At Right Angles, 5 (2).
pp. 81-84.

R, Haragopal
(2017)
*G-numbers.*
At Right Angles, 6 (3).
pp. 59-63.

R., Athmaraman
(2015)
*Problems for the middle school.*
At Right Angles, 4 (2).
pp. 59-61.

R., Haragopal
(2019)
*‘CuRe’ triplets.*
At Right Angles (4).
pp. 45-47.

RAMACHANDRAN, A
(2018)
*Mapping
triangle shapes.*
At Right Angles, 7 (2).
pp. 67-71.

RAMACHANDRAN, A.
(2017)
*CONGRUENCY AND CONSTRUCTIBILITY IN TRIANGLES.*
At Right Angles, 6 (1).
pp. 50-52.

RAMACHANDRAN, A.
(2018)
*Middle School Problems
understanding
circular motion.*
At Right Angles, 7 (2).
pp. 117-120.

RAMALINGAM, RAMYA
(2017)
*Tying it up … KNOT THEORY … without loose ends.*
At Right Angles, 6 (1).
pp. 5-13.

RAMYA, P. S.
(2017)
*Knot Theory Addendum.*
At Right Angles, 6 (1).
p. 14.

RANE, UJJWAL
(2017)
*FAGNANO’S PROBLEM A Geometric Solution.*
At Right Angles, 6 (1).
pp. 21-24.

RUDRA, SANJIB
(2018)
*Alternative solution to
‘A triangle problem’.*
At Right Angles, 7 (2).
pp. 121-122.

RVS, RAJAGOPALAN
(2018)
*Triangle inequality
- a curious
counting result.*
At Right Angles, 7 (2).
pp. 39-41.

Radhu, Jaleel
(2019)
*A challenging geometric construction problem.*
At Right Angles (5).
pp. 81-82.
ISSN 2582-1873

Raghunath, Sabitha and Bhansali, Sneha
(2019)
*π enters the 5th class.*
At Right Angles (4).
pp. 33-37.

Ramachadran, M
(2013)
*The Gregorian
Calendar.*
: At Right Angles, 2 (3).
pp. 1-3.

Ramachandran, A
(2014)
*From magic squares to magic carpets.*
At Right Angles, 3 (2).
pp. 31-33.

Ramachandran, A
(2014)
*A puzzle leading to some interesting mathematics.*
At Right Angles, 3 (1).
pp. 36-37.

Ramachandran, A.
(2015)
*Angle bisectors in a quardilateral.*
At Right Angles, 4 (1).
pp. 33-35.

Ramachandran, A.
(2019)
*DIY problems for the middle school.*
At Right Angles (4).
pp. 84-86.

Ramachandran, A.
(2019)
*Generalising the divisibility tests of 9 and 11.*
At Right Angles (5).
pp. 32-33.
ISSN 2582-1873

Ramachandran, A.
(2018)
*Problems for the middle school problems related to divisibility.*
At Right Angles, 7 (3).
pp. 69-73.

Ramachandran, A.
(2018)
*Some down-to-earth
trigonometry.*
At Right Angles, 7 (3).
pp. 53-58.

Ramachandran, A.
(2015)
*Triangle centres in an isosceles triangle.*
At Right Angles, 4 (3).
pp. 30-34.

Ramachandran, A.
(2013)
*Triangles with sides in a progression.*
At Right Angles, 2 (1).
pp. 39-40.

Ramachandran, A.
(2012)
*The four-gon family tree.*
At Right Angles, 1 (1).
pp. 53-57.

Ramachandran, A.
(2019)
*A path to π.*
At Right Angles.
pp. 31-32.

Ramanujam, R
(2017)
*Review of G H Hardy’s a mathematician's apology.*
At Right Angles, 6 (3).
pp. 112-116.

Ramanujam, R.
(2014)
*Review of Kim Plofker’s mathematics in India.*
At Right Angles, 3 (3).
pp. 82-88.

Ramesh, Sreekantan
(2013)
*Yitang Zhang and
The Twin Primes
Conjecture.*
At Right Angles, 2 (3).
pp. 1-4.

Ramprashanth, V.
(2017)
*Tonic ambiguity.*
At Right Angles, 6 (3).
pp. 22-26.

Rane, Ujjawal
(2017)
*Fagnano’s theorem: alternative proof.*
At right Angles, 6 (3).
pp. 50-52.

## S

S H I R A L I, P A D M A P R I Y A
(2017)
*The secret world of large
numbers.*
At Right Angles, 6 (2).
pp. 2-11.

SAHA, SUHAS
(2017)
*Teaching the
ternary base
using a card trick.*
At Right Angles, 6 (2).
pp. 22-29.

SANAPALA, SEETHA RAMA RAJU
(2018)
*Why does Euclid’s GCD algorithm work?*
At Right Angle, 7 (1).
pp. 60-61.

SHIRALI, SHAILESH
(2014)
*Equalizers of a triangle.*
At Right Angles, 3 (2).
pp. 14-17.

SHIRALI, SHAILESH A.
(2015)
*How to prove it.*
At Right Angles, 4 (1).

STUPEL, DR. MOSHE and FRAIVERT, DR. DAVID
(2018)
*Formulas for special
segments in a triangle.*
Right Angles, 7 (2).
pp. 72-85.

STUPEL, DR. MOSHE and OXMAN, DR. VICTOR
(2018)
*An easy construction for the harmonic mean.*
At Right Angles, 7 (1).
pp. 52-53.

Sastri, Sivasankara
(2012)
*Paper folding and the theorem of Pythagoras.*
At Right Angles, 1 (1).
pp. 48-52.

Sethuraman, B A
(2013)
*Fermat Numbers.*
At Right Angles, 2 (3).
pp. 2-5.

Shah, Tanuj
(2016)
*A diagonal investigation.*
At Right Angles, 5 (2).
pp. 38-41.

Shaikh, Majid
(2015)
*Divisibility tests by powers of 2.*
At Right Angles, 4 (2).
pp. 20-23.

Shailesh, Shirali
(2014)
*Harmonic triples.*
At Right Angles, 3 (1).
pp. 20-24.

Sharili, Shailesh
(2017)
*How to prove it.*
At Right Angles, 6 (3).
pp. 40-42.

Sharma, Shailaja D
(2018)
*Visual method for fraction multiplication.*
At Right Angles, 7 (2).
pp. 55-58.

Shirali, P
(2013)
*Teaching Subtraction.*
At Right Angles, 2 (3).
pp. 1-16.

Shirali, Padmapriya
(2018)
*Approaches to equation.*
At Right Angles, 7 (3).
pp. 1-16.

Shirali, Padmapriya
(2012)
*Fraction: a paper folding approach.*
At Right Angles, 1 (1).
pp. 80-86.

Shirali, Padmapriya
(2015)
*Measurement.*
At Right Angles, 4 (2).
pp. 1-12.

Shirali, Padmapriya
(2019)
*Percentages.*
At Right Angles (5).
pp. 1-12.
ISSN 2582-1873

Shirali, Padmapriya
(2019)
*Ratio.*
At Right Angles (4).

Shirali, Padmapriya
(2017)
*Teaching Time.*
At Right Angles, 6 (1).
pp. 1-16.

Shirali, Padmapriya
(2012)
*Teaching decimal fractions - a paper kit approach.*
At Right Angles, 1 (2).
pp. 1-7.

Shirali, Padmapriya
(2015)
*Teaching geometry-II.*
At Right Angles, 4 (1).
pp. 1-16.

Shirali, Padmapriya
(2015)
*Teaching thinking skills.*
At Right Angles, 4 (3).
pp. 1-12.

Shirali, Padmapriya
(2013)
*A place value.*
At Right Angles, 2 (1).
pp. 1-12.

Shirali, S
(2013)
*The Closing Bracket . .*
At Right Angles, 2 (3).
p. 1.

Shirali, Shailes
(2017)
*How to prove it.*
At Right Angles, 6 (1).
pp. 59-63.

Shirali, Shailesh
(2015)
*1,5,3 and so on and on and on ….*
At Right Angles, 4 (2).
pp. 24-25.

Shirali, Shailesh
(2015)
*3,4,5...And other memorable triples – Part I.*
At Right Angles, 4 (2).
pp. 15-19.

Shirali, Shailesh
(2017)
*Adventures in problem solving.*
At Right Angles, 6 (3).
pp. 108-111.

Shirali, Shailesh
(2018)
*Adventures in problem solving.*
At Right Angles, 7 (3).
pp. 79-84.

Shirali, Shailesh
(2019)
*Adventures in problem solving.*
At Right Angles (4).
pp. 96-101.

Shirali, Shailesh
(2018)
*Adventures in problem solving : a problem about divisors.*
At Right Angles, 7 (2).
pp. 130-132.

Shirali, Shailesh
(2017)
*Adventures in problem-solving : a math olympiad problem...
and a few cousins.*
At Right Angles, 6 (2).
pp. 101-105.

Shirali, Shailesh
(2018)
*Adventures in problem-solving miscellaneous problems from the RMOs.*
At Right Angles, 7 (1).
pp. 112-116.

Shirali, Shailesh
(2016)
*And other memorable triples.*
At Right Angles, 5 (2).
pp. 27-33.

Shirali, Shailesh
(2018)
*Arsalan’s amazing area problems.*
At Right Angles, 7 (3).
pp. 92-100.

Shirali, Shailesh
(2016)
*Complex Napoleon's theorem made simple - part 1.*
At Tight Angles, 5 (3).
pp. 5-11.

Shirali, Shailesh
(2017)
*Complex Napoleon's theorem made simple - part 2.*
At Right Angles, 6 (3).
pp. 28-30.

Shirali, Shailesh
(2018)
*Extending the definitions of GCD and LCM to fractions.*
At RIght Angles, 7 (2).
pp. 33-38.

Shirali, Shailesh
(2017)
*Fagnano's problem Addendum.*
At Right Angles, 6 (1).
pp. 25-28.

Shirali, Shailesh
(2017)
*Harmonic triangular triples.*
At Right Angles, 6 (3).
pp. 89-95.

Shirali, Shailesh
(2012)
*How to generate Pythagorean triples - 1.*
At Right Angles, 1 (1).
pp. 29-32.

Shirali, Shailesh
(2015)
*How to prove It.*
At Right Angles, 4 (2).
pp. 44-47.

Shirali, Shailesh
(2014)
*How to prove it.*
At Right Angles, 3 (2).
pp. 54-58.

Shirali, Shailesh
(2018)
*How to prove it.*
At Right Angles, 7 (2).
pp. 95-100.

Shirali, Shailesh
(2019)
*How to prove it.*
At Right Angles (4).
pp. 70-76.

Shirali, Shailesh
(2019)
*How to prove it.*
At Right Angles (5).
pp. 51-57.
ISSN 2582-1873

Shirali, Shailesh
(2018)
*Inequalities in algebra and geometry.*
At Right Angles, 7 (1).
pp. 75-79.

Shirali, Shailesh
(2017)
*Inequalities in algebra and geometry.*
At Right Angles, 6 (1).
pp. 53-58.

Shirali, Shailesh
(2017)
*Inequalities in algebra and geometry.*
At Right Angles, 6 (3).
pp. 67-72.

Shirali, Shailesh
(2017)
*Inequalities in algebra and geometry part 2.*
At Right Angles, 6 (2).
pp. 38-47.

Shirali, Shailesh
(2018)
*On divisibility by 27.*
At Right Angles, 7 (1).
pp. 62-65.

Shirali, Shailesh
(2013)
*One equation . . . many connects harmonic triples.*
At Right Angles, 2 (1).
pp. 20-23.

Shirali, Shailesh
(2012)
*Proof without words.*
At Rights Angles, 1 (1).
pp. 14-16.

Shirali, Shailesh
(2017)
*Quadrilaterals with perpendicular diagonals.*
At Right Angles, 6 (2).
pp. 30-37.

Shirali, Shailesh
(2015)
*Some problems
from the
Olympiads.*
At Right Angles, 4 (1).
pp. 56-58.

Shirali, Shailesh
(2018)
*Stirling set numbers & powers of integers.*
At Right Angles, 71 (1).
pp. 26-32.

Shirali, Shailesh
(2018)
*Theorem concerning a magic triangle.*
At Right Angles, 7 (2).
pp. 86-90.

Shirali, Shailesh
(2015)
*Triangle in a rectangle.*
At Right Angles, 4 (1).
pp. 64-65.

Shirali, Shailesh
(2015)
*When does it have maximum area?*
At Right Angles, 4 (2).
pp. 53-54.

Shirali, Shailesh
(2012)
*The closing bracket ...*
At Right Angles, 1 (2).
p. 1.

Shirali, Shailesh
(2015)
*The closing bracket.*
At Right Angles, 4 (1).

Shirali, Shailesh
(2019)
*The constants of mathematics - part IV : yet more on the remarkable number e.*
At Right Angles (4).
pp. 10-18.

Shirali, Shailesh
(2018)
*The constants of mathematics.*
At Right Angles, 7 (2).
pp. 19-27.

Shirali, Shailesh
(2019)
*A counter-intuitive Pythagorean surprise.*
At Right Angles (4).
pp. 19-21.

Shirali, Shailesh
(2017)
*The exponential series: an addendum.*
At Right Angles, 6 (3).
pp. 14-21.

Shirali, Shailesh
(2019)
*A triangle area problem.*
At Right Angles (4).
pp. 93-95.

Shirali, Shailesh and Athmaraman, R.
(2012)
*Fun Problems : problems for the middle school, problems for the senior school.*
At Right Angle, 1 (1).
pp. 67-75.

Shirali, Shailesh and DE, PRITHWIJIT
(2015)
*Problem for the senior schools.*
At Right Angles, 4 (1).
pp. 62-63.

Shirali, Shailesh and De, Prithwijit
(2015)
*Problems for the senior school.*
At Right Angles, 4 (2).
pp. 62-63.

Shirali, Shailesh and De, Prithwijit
(2015)
*The problem for the senior schools.*
At Right Angles, 4 (3).
pp. 93-94.

Shirali, Shailesh and Shirali, Padmapriya
(2014)
*Exploration of recurring decimals:Some explanations.*
At Right Angles, 3 (1).
pp. 40-48.

Shirali, Shailesh A
(2016)
*How to prove it.*
At Right Angles, 5 (2).
58 -62.

Shirali, Shailesh A.
(2012)
*The fine art of euclidean geometry Viviani’s theorem . . .
and a cousin.*
At Right Angles, 1 (2).
pp. 23-26.

Shirali, p
(2013)
*Exploration of
Recurring Decimals.*
At Right Angles, 2 (3).
pp. 1-4.

Shirali, Shailesh
(2017)
*Complex Napoleon's theorem made simple.*
At Right Angles, 6 (3).
pp. 28-30.

Sircar, Swati
(2019)
*Exploring properties of addition and multiplication with integers.*
At Right Angles (4).
pp. 59-65.

Sircar, Swati
(2018)
*Exploring properties of addition with whole numbers and fractions.*
At Right Angles, 7 (2).
pp. 51-54.

Sircar, Swati
(2019)
*Low floor high ceiling tasks : in-cyclic quads.*
At Right Angles (5).
pp. 47-50.
ISSN 2582-1873

Sircar, Swati
(2018)
*Mini Review: Weird number.*
At Right Angles, 7 (1).
p. 123.

Sircar, Swati
(2015)
*Of paper folding, geogebra and conics.*
At Right Angles, 4 (2).
pp. 48-52.

Sircar, Swati
(2015)
*Of paper-folding,
geogebra and
conics – Part II.*
At Right Angles, 4 (3).
pp. 72-83.

Sircar, Swati
(2019)
*Tearout : fun with dot sheets.*
At Right Angles (4).
pp. 55-58.

Sircar, Swati
(2019)
*Tearout : isometric sketches and more.*
At Right Angles (5).
pp. 43-46.
ISSN 2582-1873

Sircar, Swati
(2015)
*Thoughts on the division operation.*
At Right Angles, 4 (2).
pp. 36-39.

Sircar, Swati
(2014)
*Un-folding.*
At Right Angles, 3 (2).
pp. 42-48.

Sircar, Swati and Titus, Sneha
(2015)
*Investigations
with Pentominoes.*
At Right Angles, 4 (1).
pp. 40-49.

Sircar, Swati and Titus, Sneha
(2019)
*Joining the dots...*
At Right Angles (4).
pp. 48-53.

Sircar, Swati and Titus, Sneha
(2015)
*Keeping things in proportion.*
At Right Angles, 4 (2).
pp. 30-35.

Sircar, Swati and Titus, Sneha
(2018)
*Low floor high ceiling tasks here we go round… newer and newer spirals -open and shut cases.*
At Right Angles, 7 (1).
pp. 66-71.

Sircar, Swati and Titus, Sneha
(2017)
*Low floor high ceiling tasks sums of consecutive natural numbers.*
At Right Angles, 6 (2).
pp. 57-62.

Sreedevi, S and Banrejee, J and Titus, S
(2013)
*Teacher’s Diary
on Classroom
Assessment.*
At Right Angles, 2 (3).
pp. 1-5.

Stupel, Moshe and Siegler, Dr. Avi
(2017)
*Three elegant proofs of mathematical properties.*
At Right Angles, 6 (2).
pp. 48-53.

Subramaniam, K.
(2013)
*Pólya to the rescue: When you don’t know the solution
to a problem.*
At Right Angles, 2 (1).
pp. 60-63.

Suresh, Dakshayini
(2015)
*Review of "the sand reckoner" by gillian bradshaw.*
At Right Angles, 4 (3).
pp. 95-99.

Sury, B
(2013)
*Harmonic Sequence
and Pascal’s Triangle.*
At Right Angles, 2 (3).
pp. 1-4.

shirali, Padmapriya
(2016)
*Teaching area and perimeter.*
At Right Angles, 5 (2).
pp. 1-16.

shirali, shailesh
(2016)
*A 80-80-20 Triangle.*
At Right Angles, 5 (2).
pp. 63-65.

shirali, shailesh
(2016)
*Addendum to “A 20-30-130 triangle”.*
At Right Angles, 5 (2).
pp. 66-67.

shirali, shailesh
(2016)
*Digital roots of perfect numbers.*
At Right Angles, 5 (2).
pp. 45-49.

shirali, shailesh
(2016)
*A Problem Study.*
At Right Angles, 5 (2).
pp. 85-90.

shirali, shailesh
(2016)
*The difference-of-two-squares formula: A new look.*
At Right Angles, 5 (2).
pp. 54-57.

## T

TIKEKAR, V G
(2018)
*Addendum to
power triangle.*
At Right Angles, 7 (2).
pp. 28-29.

TIKEKAR, V G
(2013)
*There are Infinitely
many Primes.*
At Right Angles, 2 (3).
pp. 1-4.

TIKEKAR, V.G.
(2014)
*There are infinitely many primes.*
At Right Angeles, 3 (1).
pp. 15-19.

TITUS, SNEHA
(2017)
*Problems for the
MIDDLE SCHOOL.*
At Right Angles, 6 (2).
pp. 86-91.

Takker, Shikha
(2019)
*Understanding learners’ thinking through an analysis of errors.*
At Right Angles (4).
pp. 38-44.

The COMMUNITY MATHEMATICS CENTRE, COMAC
(2017)
*COnnecting
the dots...
The art and science of
interpolation and extrapolation.*
At Right Angles, 6 (2).
pp. 12-16.

Tikekar, V.G.
(2014)
*Morley’s miracle - part I.*
At Right Angles, 3 (2).
pp. 10-13.

Tikekar, V.G.
(2017)
*On the sums of powers of natural numbers.*
At Right Angles, 6 (3).
pp. 5-8.

Titus, Sneha
(2012)
*How about a math portfolio?*
At Right Angles, 1 (1).
pp. 43-47.

Titus, Sneha
(2012)
*NRICH.*
At Right Angles, 1 (2).

Titus, Sneha
(2018)
*Problems for the middle school.*
At Right Angles, 7 (1).
pp. 105-111.

Titus, Sneha
(2014)
*Teacher's diary on classroom assessment - III.*
At Right Angles, 3 (2).
pp. 34-41.

Titus, Sneha
(2018)
*The gentle man who taught infinity.*
At Right Angles, 7 (2).
pp. 140-142.

Titus, Sneha and Athmaraman, R
(2017)
*Problems for the middle school.*
At Right Angles, 6 (1).
pp. 70-72.

Titus, Sneha and Athmaraman, R.
(2017)
*Problems for the middle school.*
At Right Angles, 6 (3).
pp. 99-103.

Titus, Sneha and Ghosh, Jonaki B.
(2013)
*In a dynamic geometry environment: Exploring problems in geometry.*
At Right Angles, 2 (1).
pp. 44-48.

Titus, Sneha and Sircar, Swati
(2017)
*DADS Rule!*
At Right Angles, 6 (1).
pp. 33-38.

## V

Vyawahare, Anantw
(2017)
*Divisibility by 7.*
At Right Angles, 6 (3).
pp. 73-75.

V.G., Tikekar
(2015)
*Morley´s Miracle – Part III.*
At Right Angles, 4 (2).
pp. 5-8.

VAIDYA, ARUN
(2017)
*The breaking of the
IM CODE.*
At Right Angles, 6 (2).
pp. 5-11.

VILLIERS, MICHAEL DE
(2018)
*A cyclic Kepler quadrilateral & the golden ratio.*
At Right Angles, 7 (1).
pp. 91-94.

VISWANATH, SANKARAN
(2017)
*Predicting the
future.*
At Right Angles, 6 (2).

Venkataraman, Geetha
(2016)
*Through the symmetry lens.*
At Right Angles, 5 (2).
pp. 11-16.

Venkataraman, Geetha and Khemani, Shreya
(2012)
*Close encounters of the ‘Math ED’ kind.*
At Right Angles, 1 (2).
pp. 31-36.

Venkataraman, Geetha
(2016)
*Through the symmetry lens, part 1 : planar symmetry and frieze pattern.*
At Right Angles, 5 (1).
pp. 5-14.

Venkatasubban, Rajatadri
(2019)
*An unusual proof of the centroid theorem.*
At Right Angles (5).
pp. 34-36.
ISSN 2582-1873

Villiesrs, Michael De
(2017)
*From a golden Rectangle to golden Quadrilaterals And beyond.*
At Right Angles, 6 (1).
pp. 64-69.

Vyawahare, Anant
(2016)
*The digital root.*
At Right Angles, 5 (2).
pp. 42-44.

## Y

Yadav, Naveenkumar
(2017)
*On scalene triple.*
At Right Angles, 6 (3).
pp. 46-49.