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A tetrahedron is a triangular based pyramid that has 4 faces, 6 edges and 4 vertices
A cantellated regular tetrahedron, in the form of a regular cuboctahedron, has 14 faces (8 triangular, and 6 square), 24 edges and 12 vertices.
A truncated tetrahedron has eight 8 faces: 4 hexagonal faces and 4 triangular faces.
Tetrahedron in geogmetry is composed of four triangular faces, three of which meet at each vertex.
There are five Platonic solids: Tetrahedron (or triangular pyramid): 4 triangular faces Cube: 6 square faces Octahedron: 8 triangular faces Dodecahedron: 12 pentagonal faces Icosahedron: 20 triangular faces. Although not a Platonic solid, some people consider a sphere to be a regular 3d shape.