To accompany Folding and Unfolding in Computational Geometry:Part III: Ch.4.1: Folding a Polygon
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This applet shows the various foldings possible when a square is folded with the pentagon in the middle. Move the purple slider, F. AF=DG=GH and CF=EK=KL.

Please enable Java for an interactive construction (with Cinderella).

Created with Cinderella
Applet created by Joseph O'Rourke.