If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
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There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.
A flat square has 4 faces.
It has 5 flat faces because there are 4 flat faces at the top and 1 flat face at the bottom.
A cylinder has 2 flat, parallel faces.
A cylinder has 2 opposite parallel flat faces