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Heron's Formula

Triangle area from three side lengths

Heron's Formula — Triangle Area

Side a
Side b
Side c
Area = √(s(s−a)(s−b)(s−c)) where s = (a+b+c)/2

Heron's formula calculates triangle area from three side lengths. Named after Hero of Alexandria (c. 10–70 AD), it requires no height measurement.

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