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All of the polygons because they don't have depth
It depends on the shape. The top of a pyramid will be a point (the apex). The top (and bottom) of a prism or an antiprism will be congruent polygons.
A polyhedron.
A cube is not a polygon. Polygons are 2-dimensional figures and a cube is 3-dimensional.
Yes. Parallelograms are flat shapes (polygons). 3-dimensional forms are polyhedrons.