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A Concurrency Theorem and Geometer's Sketchpad

by Larry Hoehn (Austin Peay University)

This article originally appeared in:
College Mathematics Journal
March, 1997

Subject classification(s): Geometry and Topology
Applicable Course(s): 4.9 Geometry

The author draws a triangle inside a circle and extends the sides to meet the circle. Then he joins the resulting points and proves that the resulting lines are concurrent.


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