Heron's formula

Heron's formula is used to find the area of triangle using its length of its sides.

The formula is:

${\displaystyle A={\sqrt {s(s-a)(s-b)(s-c)}}.}$

${\displaystyle a,b,c}$ are the sides and ${\displaystyle s}$ is semi perimeter = ${\displaystyle A+B+C/2}$