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The apothem of a regular polygon $P$ is defined as the perpendicular distance from the center of $P$ to one of its sides.


In the above, the length of $OM$ is the apothem of the regular polygon.

Also known as

The apothem of a regular polygon is also known as its short radius.

Also see

Linguistic Note

The word apothem is pronounced ap-o-th'm (the last syllable with as little stress as the second).

It comes from Ancient Greek ἀπόθεμα (apóthema), meaning deposit, from:

ἀπό (apó), meaning off or away
θέμα (théma), meaning that which is laid down.