The correct pyramid. Properties

The lateral surface of the pyramid is the sum of the areas of its lateral faces.

Theorem

The lateral surface of a regular pyramid is equal to the product of a semi-perimeter of the base and apothem.



Evidence

If the base side is a, the number of sides is n, then the side surface of the pyramid is equal to:



where l is apothem, p is the perimeter of the base of the pyramid. The theorem is proved.