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Pythagoras by the Cross Ratio

by Rebecca Conley and John Jaroma

This article originally appeared in:
College Mathematics Journal
January, 2006

Subject classification(s): Geometry and Topology | Plane Geometry | Triangles
Applicable Course(s): 4.19 Complex Variables

This capsule applied the concept of cross ratio in complex analysis to derive the Pythagorean Theorem. It appears to be the first in the literature to use this approach to prove the famous theorem.

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