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A regular tetrahedron (triangular pyramid).
tetrahedron aka triangular pyramid
A regular tetrahedron. octahedron, dodecahedron.
Because a tetrahedron is a triangular based pyramid that has 4 identical faces and 4 faces meet at all the vertices.
A tetrahedron. In fact the family of pyramids. A pyramid, whose base is an n-sided polygon will always have n+1 faces and n+1 vertices.