A triangle has sides with lengths: 7, 2, and 22. How do you find the area of the triangle using Heron's formula?
This triangle can not exist.
It is impossible to have a triangle with one side longer than the sum of the other two sides.
(If you attempt to use Heron's formula you will end up with the square root of a negative number, but it is not necessary to go this route to see that such a triangle is not possible.)