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A general (not necessarily regular) tetrahedron, defined as a convex polyhedron consisting of four (not necessarily identical) triangular faces can be specified by its polyhedron vertices as , where , ..., 4. Then the volume of the tetrahedron is given by.
Pyramid (geometry) A pyramid is a three-dimensional shape. It has triangular sides that come together in a point at the top, call the apex. A pyramid with a square base (bottom) and four sides is called a square pyramid. A pyramid with a triangular base and three sides is called a tetrahedron.