A pyramid is called correct if its base is a regular polygon, and the heights coincide with the center of this polygon.
The axis of a regular pyramid is called a straight line containing height.
At the correct pyramid:
1. The side edges are equal;
2. Side faces - isosceles triangles.
The height of the side face of a regular pyramid drawn from its top is called apothema .
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Stereometry
Terms: Stereometry