Sunday, June 5, 2011

Viviani's Theorem created with GeoGebra 4.0 beta

Viviani's theorem, named after Vincenzo Viviani, states that the sum of the distances from a point to the sides of an equilateral triangle equals the length of the triangle's altitude.

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

The theorem can be extended to equilateral polygons and equiangular polygons. Specifically, the sum of distances from a point to the side lines of an equiangular (or equilateral) polygon does not depend on the point.

Text Source: Wikipedia

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