Tetrahedron
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A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.
The figure described is a polyhedron. It is a tetrahedron known as a triangular pyramid.
i think its allec a polygobn
A tetrahedron (4 faces) and an icosahedron (20).
A tetrahedron is the smallest possible polyhedron: a closed 3-d shape with polygonal faces. It has 4 triangular faces, 4 vertices and 6 edges. It is also known as a triangle-based pyramid.