http://demonstrations.wolfram.com/DissectingAPyramidIntoFourEqualPieces
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration shows the decomposition of a tetrahedron into four congruent solids. This has already been marketed as a popular puzzle in which the pieces are to be assembled back into a pyramid.
Contributed by: Jaime Rangel-Mondragon
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