Wolfram Demonstrations Project

This Demonstration shows a pentagon constructed using a straight edge and compass given the length

of one side. The construction uses five circles, each with radius

. All five sides are equal but the pentagon is not regular.

For more information, see A. Dürer, Approximate Construction of Regular Pentagon, cut-the-knot.org.

Contributed by: Ralph Leon

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Common Core State Standards for Mathematics

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Albrecht Dürer's Pentagon of 1525