A tetrahedron need not have any symmetry.
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yes, in fact it can have 6 rotational symmetries.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
A Tetrahedron. The most common form of a tetrahedron is called a regular tetrahedron, or a pyramid
A tetrahedron has 4 vertices.