Yes. A tetrahedron is a closed 3-d shape with 4 triangular faces. In a regular polygon, each of these is an equilateral triangle.
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A regular polygon has all its angles equal AND all its sides equal. A nonregular polygon has at least one angle or one side that is different from the others.
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
It can be but need not be.
A tetrahedron is a four sided polyhedron. Each face is a triangle. If it is a regular tetrahedron, then each face is an equilateral triangle.