A flat square has 4 faces.
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It has 5 flat faces because there are 4 flat faces at the top and 1 flat face at the bottom.
yes,yes it does
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.
Faces are sides but sides (as in sides of a square) need not be faces.
a pyramid with a triangular base has 4 faces. a pyramid with a square base has 5 faces.