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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 unique among the uniform polyhedra in possessing no parallel faces.

Note: This article excerpts material from the Wikipedia article "Tetrahedron", which is released under the GNU Free Documentation License.

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