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(also **Heron's formula**)

A formula giving the area of a triangle in terms of the lengths of its sides.

For a triangle with sides of length a, b, and c, the area A = √s(s − a)(s − b)(s − c), where s = ½(a + b + c).

Late 19th century. From the genitive of the name of Hero (also Heron) of Alexandria (fl. ca.d. 60), scientist and engineer, who described the formula.

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