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( Tetrahedron)
A tetrahedron (plural tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is one in which the four triangles are regular, or "equilateral," and is one of the Platonic solids. The tetrahedron is one kind of pyramid, the second most common type; a pyramid has a flat base, and triangular faces above it, but the base can be of any polygonal shape, not just square or triangular. Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper. For a regular tetrahedron of edge length a
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