Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
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This Demonstration shows Frederickson's dissection of a dodecagon into two dodecagons
Contributed by: Izidor Hafner (August 2016)
Open content licensed under CC BY-NC-SA
 G. N. Frederickson, Hinged Dissections: Swinging & Twisting, Cambridge: Cambridge University Press, 2002 p. 162.