# Dissection of a Regular Enneagon into Four Congruent Regular Enneagons

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This Demonstration shows a dissection of a regular enneagon into four congruent regular enneagons.

Contributed by: Izidor Hafner (August 2016)

Open content licensed under CC BY-NC-SA

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Reference

[1] G. N. Frederickson, *Hinged Dissections: Swinging & Twisting*, Cambridge: Cambridge University Press, 2002 p. 158.