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Concept

Apothem of a Regular Polygon

An apothem of a regular polygon is a perpendicular line segment from the center of the polygon to the midpoint of any of its sides. The apothem bisects the side where its endpoint is.
A pentagon with one apothem drawn

An apothem can refer either to the segment itself or its length — all the apothems of a regular polygon are congruent. Keep in mind that only regular polygons have apothems.

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