 Heron's formula (source code)

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= Heron's formula
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= Heron formula
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For a <triangle> with side lengths $a,b,c$ and <semiperimeter> $s=(a+b+c)/2$, its <area> is $A=\sqrt{s(s-a)(s-b)(s-c)}$. This expresses the <area> using only the three side lengths.

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