cube
pyramid
cylinder
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3-d objects with only flat surfaces (a different question) are polyhedra.
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A cube has 6 flat surfaces. Most boxes of all shapes also have six flat surfaces
Flat surfaces: 6Curved surfaces: 0.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
It has 6 faces which are its flat surfaces.
There are 2 flat surfaces, both are circles.