apothem

noun
ap·o·them | \ ˈa-pə-ˌthem \

Definition of apothem 

: the perpendicular from the center of a regular polygon to one of the sides

First Known Use of apothem

1813, in the meaning defined above

History and Etymology for apothem

International Scientific Vocabulary apo- + -them (from Greek thema something laid down, theme)

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The first known use of apothem was in 1813

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