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Four Visual Proofs of a Theorem about a Regular Nonagon

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This Demonstration shows four visual proofs that , where , , and are the lengths of a side, the shortest diagonal, and the longest diagonal, respectively, of a regular nonagon. The interior angle of the regular nonagon is , so that angle 451 equals .

Contributed by: Izidor Hafner (January 2016)
Open content licensed under CC BY-NC-SA

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[1] Š. Arslanagić, Matematička čitanka 4, Sarajevo, 2012, pp. 63–72.

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