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-The
tetrahedron is one of the 5 Platonic solids.
-The left
solid is made from four maple triangles (hollow).
The middle model's faces are made from tulip wood,
purple heart, padauk, and ebony.
-Tetrahedrons are the simplest of all deltahedra, and are self dual
(the centres of each face give the vertices of another tetrahedron).
-Since there
is V=4 vertices, E=6 edges and F=4 faces, Euler's formula is
satisfied: V+F = E+2.
-In the
right picture, a tetrahedron (birch coffee stir sticks) is inscribed
within a cube.
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