a face or part of a face of a three-dimensional solid that's on the inside of a composite figure.
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These are very hard to spell but here you go: 17 faces: septadecahedron 18 faces: octadecahedron 19 faces: nonadecahedron 20 faces: icosahedron 21 faces: unicosahedron 22 faces: dicosahedron 29 faces: nonicosahedron 30 faces: tricontahedron
A Prismthe faces are called bases
it has six faces
6 faces
A cone has two faces.