For every polyhedron, there is a dual which is a polyhedron that has:
A self-dual polyhedron is a polyhedron whose dual is the same shape.
All pyramids, for example, are self-dual.
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No. A polyhedron is a three dimensional body. The base of a pyramid is a two dimensional figure.But any non self-intersecting polygon can be the base of a pyramid.
No, they are the faces of the polyhedron.
They are the faces of the polyhedron.
No, a cubiod is not a polyhedron but a cuboid is.
Yes, a cube is a polyhedron.