Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
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A tetrahedron is 3-dimensional and so it looks just like an ordinary tetrahedron.
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There are a great many things in the world that can be shaped like a hexagon. Stop signs can for example.
Imagine a pyramid, with a triangle shaped base, with three sides coming up each of which is a triangle. That is a tetrahedron (4 sides, all the same side, with each one the shape of a triangle). * * * * * Mostly correct, but the four faces need not all be the same.
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