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4 faces: tetrahedron; a pyramid with a triangular base has 4 faces.

5 faces: pentahedron; A triangular prism (the sort you make a rainbow with) is a pentahedron; a square pyramidis a pentahedron - it has a square base and 4 triangular sides.

6 faces: hexahedron; a regular hexahedron, with all its faces square, is a cube. 7 faces: heptahedron 8 faces: octahedron

9 faces: enneahedron

10 faces: decahedron

11 faces: hendecahedron 12 faces: dodecahedron

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