Completing a Tetrahedron to a Parallelepiped

This Demonstration shows a completion of a tetrahedron to a parallelepiped . The four vertices of are vertices of , and the edges of become four diagonals on the faces of .


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The construction is described in [1, pp. 106–107].
[1] V. V. Prasolov and I. F. Sharygin, Problems in Stereometry (in Russian), Moscow: Nauka, 1989.
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