Albrecht Dürer's Heptagon of 1525

This Demonstration shows a heptagon constructed in six easy steps using a straight edge and compass.
The heptagon is not regular. For example, one angle at the midpoint is ≈ 51° 19' instead of 360° / 7 ≈ 51° 26'.

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DETAILS

For more information, see A. Dürer, Underweysung der Messing mit dem Zirckel und Richtscheyt (Treatise on Mensuration with Compass and Ruler), 1525.
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Related Curriculum Standards

US Common Core State Standards, Mathematics