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Proof without Words

by Samuel Wolf

This article originally appeared in:
Mathematics Magazine
October, 1989

Subject classification(s): Geometric Proof | Geometry and Topology
Applicable Course(s): 4.9 Geometry | 4.1 Introduction to Proofs

The picture proves Viviani's Theorem: that the sum of the distances from an interior point to the sides of an equilateral triangle always add to the height of the triangle.

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