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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'.


	Contributed by: Ralf Schaper
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For more information, see A. Dürer, Underweysung der Messing mit dem Zirckel und Richtscheyt (Treatise on Mensuration with Compass and Ruler), 1525.

Heptagon (Wolfram MathWorld)

Geometric Construction (Wolfram MathWorld)

"Albrecht Dürer's Heptagon of 1525" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/AlbrechtDurersHeptagonOf1525/

Contributed by: Ralf Schaper

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