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A square base, and four triangular shaped sides equals five flat surfaces.
None, because there can be no such thing as a triangular square. If it is triangular it cannot be a square, if it is a square it cannot be triangular.
square pyramid
A triangular pyramid has a triangular base and three triangular faces meeting at its apex. A square pyramid has a square base and four triangular faces meeting at its apex.
A Triangle! (musical instrument)The (Swanson) speed square and the navigational triangle are two other triangular instruments.