It is a 3-D shape because a tetrahedron can be folded into a net!
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.