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to the tetrahedron's faces.

Regular tetrahedron

A regular tetrahedron is a tetrahedron in which all four faces are equilateral triangles. In other words, all of its faces are the same size and shape (congruent) and all edges are the same length. The regular tetrahedron is the simplest deltahedron, a polyhedron all of whose faces are equilateral triangles; there are seven other convex deltahedra.

Irregular tetrahedra

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