A 808020 Triangle
shirali, shailesh (2016) A 808020 Triangle. At Right Angles, 5 (2). pp. 6365.

Text
 Published Version
Download (163kB)  Preview 
Abstract
In the previous issue of At Right Angles, we studied a geometrical problem concerning the triangle with angles of 130 ◦ , 20 ◦ and 30 ◦ . We made the comment that the problem belongs to a class of geometrical problems dealing with triangles with numerous lines drawn within them, intersecting at angles whose measures are an integer number of degrees; we are required to find the measure of some indicated angle. In this note, we study another problem of this genre—a particularly famous such problem. We present a trigonometric solution as well as a ‘pure geometry’ solution.
Item Type:  Articles in APF Magazines 

Uncontrolled Keywords:  Integer degree, sine rule, addition formula for sine, difference formula for cosine, isosceles, equilateral, triangle 
Subjects:  Natural Sciences > Mathematics 
Divisions:  Azim Premji University > University publications > At Right Angles 
Depositing User:  Mr. Sachin Tirlapur 
Date Deposited:  24 Sep 2018 11:42 
Last Modified:  24 Sep 2018 11:42 
URI:  http://publications.azimpremjifoundation.org/id/eprint/1440 
Publisher URL:  http://apfstatic.s3.apsouth1.amazonaws.com/s3fs... 
Actions (login required)
View Item 
Altmetric
CORE (COnnecting REpositories)