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Albrecht Dürer's Nonagon of 1525

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This Demonstration shows a nonagon constructed in seven easy steps using straightedge and compass. The nonagon is not regular. For example, one angle at the midpoint is approximately 39° 35' instead of 40°.

Contributed by: Ralf Schaper (March 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).

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