Final answer:
A regular polygon base with a vertex over the center of the base describes a right prism.
Step-by-step explanation:
A regular polygon base with a vertex over the center of the base describes a right prism. In a right prism, the lateral faces are rectangles and the base is a regular polygon, such as a square or a triangle, with the vertex over its center. This is different from a pyramid, where the base can be any polygon and the vertex is not over the center of the base.
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