$\"\"$

The sides of triangle are $\"\"$ .

To find the area of triangle by using Heron $\"\"$ s area formula then you conclude that $\"\"$ .

$\"\"$ (Write Heron $\"\"$ s area formula)

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Simplify) $\"\"$

The area of triangle is 399.04.