https://en.wikipedia.org/wiki/Heron%27s_formula

In geometry, Heron's formula (sometimes called Hero's formula), named after

Hero of Alexandria, gives the **area** of a triangle when the length of all three sides

are known. Unlike **other** formulas, there is no need to calculate **other** distances in

the triangle first. Contents. 1 Formulation; **2** Example; 3 History; 4 Proofs ...

Heron's formula states that the **area** of a triangle whose sides have lengths a, ...

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