Question

What is Hero’s or Heron’s formula?

Answer

Hero's of Heron's formula is connect the area of a triangle with its sides, we use this formula. If a, b and c are the length of the sides of a triangle, its area is $\mathrm{Area\; of\; triangle}=\sqrt{s\left(s-a\right)\left(s-b\right)\left(s-c\right)}$
$\mathrm{where\; \; \; }s=\frac{a+b+c}{2}$