Ramachandran, A.
(2012)
The four-gon family tree.
At Right Angles, 1 (1).
pp. 53-57.
Abstract
A Diagonal Connect
Classification is traditionally defined as the precinct of biologists. But classifi-
cation has great pedagogical implications — based as it is on the properties
of the objects being classified. A look at a familiar class of polygons — the
quadrilaterals — and how they can be reorganized in a different way.
quadrilaterals have traditionally been classified on the
basis of their sides (being equal, perpendicular, paral-
lel or angles (being equal, supplementary, ...). Here
we present a classification based on certain properties of their diagonals. In this approach, cert
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