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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.
In a rigorous geometrical sense, there is no difference between tetrahedron and trigonal pyramid --the terms both mean the same thing. In colloquial and chemical use, however, 'tetrahedron' typically implies the ' regular tetrahedron ', where all four faces are equilateral triangles.n a rigorous geometrical sense, there is no difference between tetrahedron and trigonal pyramid --the terms both mean the same thing. In colloquial and chemical use, however, 'tetrahedron' typically implies the ' regular tetrahedron ', where all four faces are equilateral triangles.