Spheres
Circles, squares, rectangles, and triangles are solids that have a flat surface.
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A cylinder
A cube has six flat surfaces, but so do other solids. Look up 'hexahedron' in wikipedia.
A cube has 6 flat surfaces. Most boxes of all shapes also have six flat surfaces
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A cube has 6 faces, so it would have 6 flat surfaces
It has 6 faces which are its flat surfaces.
A rectangular prism has 6 flat surfaces
A cuboid has 6 sides/faces/flat surfaces.
A square has 4 flat surfaces.