apothem

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apothem

[′ap·ə‚them]
(mathematics)
The perpendicular distance from the center of a regular polygon to one of its sides. Also known as short radius.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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We know that from the area of a triangle, (OT's first corollary,) we can find the area of a regular polygon, and that it is equal to 1/2 ap where a is the length of the apothem and p is the perimeter.