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A pyramid must have at least four faces (sides) so a three sided pyramid is mathematically impossible.
5 FIVE five 4+1=5
A square pyramid has four triangular faces and one square face. In total, that is five faces.
A face is each side of an object, usually excluding the base. In this case, 3 faces.
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 5 faces, 5 vertices, 10 edges