A polyhedron composed of four triangular faces. If all four faces are equilateral triangles, the tetrahedron is regular. Also known as a triangular pyramid.

A compound of two regular tetrahedra is called a stellated octahedron.

Examples

• Danbooru asset #20875379

See also

• d4 (die)

External links

• George Hart: Virtual polyhedra compounds
• Wikipedia: Tetrahedron
• Wolfram MathWorld: Regular Tetrahedron

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