He'ro's for'mula

Pronunciation: (hēr'ōz), [key] Geom.
the formula for the area of a triangle when the sides are given: for a triangle with sides a, b, and c, the area is equal to &Herosform;, where s is equal to one half the perimeter of the triangle.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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