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In accordance with WolframAlpha:

"Heron's Theorem

"The area (delta) of a triangle with side lengths a, b and c and semiperimeter s is given by (delta) = sqrt(s * (s-a) *(s-b) * (s-c))

...

Proof source: Heron of Alexandria. Proposition 1.8 in Metrica. Ca. 60 A.D."

So Proposition 1.8 of Metrica is the well known Heron's Formula for finding the area of a triangle given its sides.

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13y ago

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