be more specific. do you mean a 3-D figure? in that case, it would be a triangular pyramid.
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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.
If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
a pyramid with a triangular base has 4 faces. a pyramid with a square base has 5 faces.
A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.