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Albrecht Dürer's Heptagon of 1525

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This Demonstration shows a heptagon constructed in six easy steps using a straight edge and compass.

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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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Contributed by: Ralf Schaper (February 2009)
Open content licensed under CC BY-NC-SA

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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.

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