what pyramid has 4 faces

A tetrahedron, also known as a triangular pyramid, has 4 faces, 4 vertices including the apex, and 6 edges. A tetrahedron is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. A triangular-based pyramid is also known as a tetrahedron, and it has four faces that are all triangles. Therefore, a pyramid that has 4 faces is a tetrahedron or a triangular pyramid.