Tetrahedron
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In geometry, a tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. It has six edges and four vertices. The tetrahedron is the only convex polyhedron that has four faces.
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See also
- Boerdijk–Coxeter helix
- Caltrop
- Demihypercube
- Disphenoid – a tetrahedron with mirror symmetry
- Hill tetrahedron
- Orthocentric tetrahedron
- Simplex
- Tetra Pak
- Tetrahedral kite
- Tetrahedral number
- Tetrahedron packing
- Triangular dipyramid – constructed by joining two tetrahedra along one face
- Trirectangular tetrahedron
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