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unit of measure: the base unit | the supplementary unit | the derived unit

*geometry: the area of a flat figure | the area of a solid | the volume of the solid*

A ** tetrahedron** is a polyhedron, and its faces are equilateral triangles, including base and lateral faces.

A tetrahedron is a polyhedron composed of four triangular faces, any of those three having an intersection point in one of those four point. The tetrahedron is the simplest type of pyramid, and its base is a triangle, that is why it is called triangular pyramid.

A particular case is the regular tetrahedron, where all faces are equilateral and it is one of those five types of regular polyhedrons.

where:

a — the side of a tetrahedron.

*For separation of number integers and decimals, use the symbol – point [.]*

context information: contemporary and archaic unit of measurement of area