Difference between tetrahedron and triangular pyramid?
A triangular pyramid is a pyramid having a triangular base. The tetrahedron is a triangular pyramid having congruent equilateral triangles for each of its faces.
A tetrahedron (regular tetrahedron) is a special case of the triangular pyramid that has four equivalent equilateral triangular faces - the base and the other three sides.
A tetrahedron (regular tetrahedron) is a special case of the triangular pyramid that has four equivalent equilateral triangular faces - the base and the other three sides.