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Proof Without Words: Equilateral Triangle

by James Tanton

This article originally appeared in:
Mathematics Magazine
October, 2001

Subject classification(s): Geometry and Topology | Plane Geometry | Triangles | Logic and Foundations
Applicable Course(s): 4.9 Geometry

The fact that, for an equilateral triangle, the sum of the distances from any interior point to the three sides is equal to the height of the triangle is shown visually.

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