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Heron of Alexandria (ca 200) wrote on many aspects of applied mathematics. In his work On Measurement, he presents a formula for the area of a triangle given the lengths of its three sides: a, b and c.
Area = [s(s-a) (s-b)(s-c)]1/2 where s = (a + b + c)/2
Prove Heron's Formula is correct.
"Heron's Formula," Loci (March 2007)