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Polyhedra are named according to the number of faces that they have. So a 3d dodecagon, called a dodecahedron would have 12 faces.
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There is no 3D dodecagon. A dodecahedron is a 3D shape with 12 polygonal faces. There are 6,384,634 topologically distinct convex dodecahedra. The best known is made up of 12 regular pentagons.
Six faces
A 3D square is surely a cube? Therefore, a cube has 6 faces.
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