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Hero's formula

[heer-ohz] /ˈhɪər oʊz/
noun, Geometry
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 , where s is equal to one half the perimeter of the triangle.
named after Hero of Alexandria
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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