http://demonstrations.wolfram.com/APolygonThatFoldsIntoARegularTetrahedronOrI...
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows a polygon that folds into a regular tetrahedron or into a rectangular solid.
Contributed by: Izidor Hafner
Based on work by: Erik D. Demaine and Joseph O'Rourke
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