A triangular base pyramid which is a tetrahedron has 4 faces, 6 edges and 4 vertices
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A pyramid can have 0 or 1 square faces. It can have 4 or more faces - there is no limit.
The answer is no. A square pyramid can not have all triangle faces because the base of this particular pyramid would be a square.
The faces are the flat, triangle-shaped surfaces that make up the surface of the pyramid. A pyramid has four faces.
A triangular-based pyramid has 4 corners, 4 faces and 6 edges.