$\"\"$

Observe the figure:

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

Find the perimeter:

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

Substitute $\"\"$ , $\"\"$ and $\"\"$ in the formula

$\"\"$

$\"\"$ (The common denominator is $\"\"$ )

$\"\"$ (Add)

$\"\"$ (Simplify)

Therefore, the perimeter of the triangle is $\"\"$ .

$\"\"$

The perimeter of the triangle is $\"\"$ .