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A TETRAHEDRON, which is commonly referred to a a triangular based pyramid. The jokingly, a sphere. It has two faces, and outside face and an inside face, Ha!!!Ha!!!
A polyhedron can have any number of faces 4 or higher.
A polyhedron must have at least 4 faces, at least 4 vertices and at least 6 edges.
6 edges 4 faces and 4 verticies
no a cuboid is not a polyhedron if it was it would have 9 faces