Math. the perpendicular from the center of a regular polygon to any one of its sides
Origin of apothemModern Latin from apo- + Classical Greek thema, that which is placed: see theme
The perpendicular distance from the center of a regular polygon to any of its sides.
Origin of apothemapo- Greek thema something laid down ; see theme .
From Ancient Greek ἀπόθεμα (apothema, “deposit”), from ἀπό (apo, “off, away”) + θέμα (thema, “that which is laid down”).