A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles ...
A net will always be made up of the same number of connected 2D shapes as there are faces on the 3D shape, excluding folding flaps of course. For example, this cube net becomes this die.
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