A triangular based pyramid (which is a tetrahedron) has 1 base,4 flatfaces, 6 edges and 4 vertices
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a pyramid with a triangular base has 4 faces. a pyramid with a square base has 5 faces.
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 flat faces, 6 edges and 4 vertices.
If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
A pyramid