$\"\"$

The lengths of the sides of the triangle are $\"\"$ , $\"\"$ and $\"\"$ .

Herons formula for area of a triangle is $\"\"$ .

Where $\"\"$ .

Substitute $\"\"$ , $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ in $\"\"$ .

Area of the triangle $\"\"$

$\"\"$

Area of the triangle is $\"\"$ .