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Quadrilateral Slide
A quadrilateral slide (or Q-slide) transforms one quadrilateral to another with the same angles. The notion was introduced by Harry Lindgren (1956).


G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997, 2002 pp. 41-42.


"Quadrilateral Slide" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/QuadrilateralSlide/
Contributed by: Izidor Hafner
Based on work by: Greg N. Frederickson
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