K., Baburajan
(2021)
Areas of triangles between two parallel lines with same base are equal : proof(?) by paper folding.
At Right Angles.
pp. 2130.
ISSN 25821873
Abstract
There are many methods to prove that the areas of triangles
between two parallel lines and with the same base length are
equal. Here, we are discussing the proof using a paper
folding method. We give the geometric reasoning of the
proof and follow it up with the implications of this in the
paper folding activity. During the paper folding activity,
some geometrical properties are used intuitively, and the
questions alongside will serve to stimulate both observation
as well as reasoning and deductive skills in the students. We
hope that this approach illustrates that results which are
observed during the paper folding are based on beautiful and
rigorous mathematics.
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