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A tetrahedron is a three-dimensional object that has four faces, six edges, and four vertices. It can be considered as pyramid whenever one of its faces can be considered as the base. Unlike other pyramids and other polyhedrons, the tetrahedron is one of the polyhedrons that does not have diagonal space; the other polyhedrons with such property are Csazar polyhedron and Schonhardt polyhedron.

Many properties of a general tetrahedron are explicitly described in the following.