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For planar faces, any number you want of 4 of more.

examples:

  • a tetrahedron has 4 faces
  • a triangular prism has 5 faces
  • a cube has 6 faces
  • a hexagonal prism has 8 faces
  • a dodecagonal prism has 12 faces
  • an icosahedron has 20 faces

Using a prism, the number of faces is the number of sides of the polygon of the ends plus 2. As any polygon can be used for the ends, the number of faces possible is any number 5 or more.

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