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geometry > geometric figure > polytope > regular polytope > regular tetrahedron
... > geometry > geometric figure > polyhedron > pyramid > tetrahedron > regular tetrahedron

Preferred term

regular tetrahedron  

Definition(s)

  • A regular tetrahedron is a tetrahedron in which all four faces are equilateral triangles. It is one of the five regular Platonic solids, which have been known since antiquity. In a regular tetrahedron, all faces are the same size and shape (congruent) and all edges are the same length.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Tetrahedron#Regular_tetrahedron)

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http://data.loterre.fr/ark:/67375/PSR-T2FNZP9F-J

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