Squares and triangles
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A triangular pyramid has four triangular faces.
a triangular based pyramid has 4 faces.
triangular pyramid
A square pyramid has a square base and four congruent triangular faces.
No, it has five plus the bottom :D * * * * * The previous answer is incorrect: a pyramid with 5 faces plus the bottom would be a pentagon based pyramid! A triangular based pyramid, or tetrahedron, DOES have 4 triangular faces.