its a pyramid isn't it?
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Since a cube has 6 faces, you would be looking for a solid shape with only 2 faces and no such solid exists.
pyramid
A tetrahedron or triangular pyramid.
rectangular prism
Yes. The cylinder is a solid (solid object), and it has two faces that are circles, and will roll - just as described in the question. Use the link below to see a diagram of a cylinder.