It is the apex.
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tat the pentagonal pyramid has a point at the top and the pentagonal prism is flat with out a point.
A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
they both have a point at the top and is both three demensional shapes with polygons on the sides
It is called a frustum.