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Albrecht Dürer's Nonagon of 1525
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°.


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


"Albrecht Dürer's Nonagon of 1525" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/AlbrechtDurersNonagonOf1525/
Contributed by: Ralf Schaper
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