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Three Hinged Dissections of Squares
The Demonstration shows Perigal's (1873) hingable dissection of two squares to one square, a generalization of Abul-Wafa's hingable dissection of three squares to one square, and another hingable dissection of three squares to one based on Perigal's dissection.


G. N. Frederickson, Hinged Dissections: Swinging & Twisting, New York: Cambridge University Press, 2002 pp. 33–41.


"Three Hinged Dissections of Squares" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/ThreeHingedDissectionsOfSquares/
Contributed by: Izidor Hafner
Based on work by: Greg N. Frederickson
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