Heron’s formula

Heron’s formula, a method to calculate the area of a triangle when the lengths of all three sides are known. The formula is credited to Greek mathematician and inventor Heron of Alexandria (flourished c. 62 ce).

If a triangle has sides of length a, b, and c, then its area can be found using$Area =\sqrt{s(s-a)(s-b)(s-c)}$where s is half of the perimeter, or$s = \frac{a + b + c}{2}$.