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Hero's formula

[heer-ohz]
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noun Geometry.
  1. 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.
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Origin of Hero's formula

named after Hero of Alexandria
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018