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The shape is 3 dimensional, the top down view is 2 dimensional.
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.
If the base of the pyramid is square, it must have four triangular vertical faces in order to meet at the apex (top). Such a 3D shape is a "square pyramid".
Yes as they get smaller in size going towards the top of the pyramid.
A square-based pyramid