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A cube has 6 square faces, 12 edges and 8 vertices
A rectangular solid that is not a cube has 3 planes of symmetry.
A cube prism has 5 sides one way to prove this is by seeing that this is how a card board box is made, with five squares.
well that's a dumb question figure it out! but, its 12
cube There are a great many solid shapes that have only flat surfaces.