Twist-Hinged Dissection of One Octagon into Four Octagons
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This Demonstration shows a twist-hinged dissection of an octagon into four octagons.
Contributed by: Izidor Hafner (August 2013)
Open content licensed under CC BY-NC-SA
 G. N. Frederickson, Hinged Dissections: Swinging & Twisting, New York: Cambridge University Press, 2002 p. 255. www.cs.purdue.edu/homes/gnf/book2.html.