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Heron's formula
Triangle area in terms of side lengths / From Wikipedia, the free encyclopedia
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This article is about calculating the area of a triangle. For calculating a square root, see Heron's method.
In geometry, Heron's formula (or Hero's formula) gives the area of a triangle in terms of the three side lengths
Letting
be the semiperimeter of the triangle,
the area
is[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Triangle_with_notations_2_without_points.svg/198px-Triangle_with_notations_2_without_points.svg.png)
It is named after first-century engineer Heron of Alexandria (or Hero) who proved it in his work Metrica, though it was probably known centuries earlier.