It can be but need not be.
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Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
Yes. A tetrahedron is a closed 3-d shape with 4 triangular faces. In a regular polygon, each of these is an equilateral triangle.
Regular Tetrahedron
A regular tetrahedron (triangular pyramid).
A regular tetrahedron. octahedron, dodecahedron.