
The apothem of a regular polygon is a line segment from the center to the midpoint of one of its sides. Equivalently, it is the line drawn from the center of the polygon that is perpendicular to one of its sides. The word `apothem` can also refer to the length of that line segment. Regular polygons are the only polygons that have apothems. Becau.....
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http://en.wikipedia.org/wiki/Apothem

• (n.) The perpendicular from the center to one of the sides of a regular polygon. • (n.) A deposit formed in a liquid extract of a vegetable substance by exposure to the air.
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http://thinkexist.com/dictionary/meaning/apothem/

© mathisfun.com Also known as a short radius, the perpendicular distance from the center of a regular polygon to one of its sides. It is the same as the radius of a circle inscribed in the polygon.
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http://www.daviddarling.info/encyclopedia/A/apothem.html
Ap'o·them noun [ Greek ... + ... that which is placed, ... to place.]
1. (Math.) The perpendicular from the center to one of the sides of a regular polygon.
2. A deposit formed in a liquid extract of a vegetable substance by exposure to the air.
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http://www.encyclo.co.uk/webster/A/105

Type: Term Pronunciation: ap′ō-them, ap′ō-thēm Definitions: 1. A precipitate caused by long boiling of a vegetable infusion or by its exposure to air.
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http://www.medilexicon.com/medicaldictionary.php?t=5622

a perpendicular from the center of a regular polygon to one of its sides.
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https://www.infoplease.com/dictionary/apothem
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