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One square and four triangles.
Four of them
A square pyramid has 5 faces. The four side faces are triangles, and the base is in the form of a square. This pyramid has 5 vertices and 8 edges.
A four sided pyramid with a square base.
A tetrahedron is made up of four equal sided triangular sides (a pyramid has four triangular sides and a square base, but that's probably not what you were looking for). The triangle itself always has exactly three sides.