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.
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Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
Triangle In a tetrahedron, all sides are triangles
It have four bonds and no lone pairs.So shape is tetrahedron.
A tetrahedron is a 3-dimensional shape - a triangular pyramid. It is NOT a number.
It can be but need not be.