Nobody made a tetrahedron. Tetrahedral molecules, such as methane, exist in outer space and were present long before the solar system formed. There was nobody around to invent it then!
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It is a tetrahedron
A regular tetrahedron
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
A Tetrahedron. The most common form of a tetrahedron is called a regular tetrahedron, or a pyramid