$\"\"$

Observe the figure:

Here $\"\"$ and $\"\"$ is the sides of the triangle.

Where $\"\"$ , $\"\"$ .

Find the perimeter if $\"\"$ and $\"\"$ .

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

Find perimeter of the triangle.

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

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

$\"\"$ (Multiply)

$\"\"$ (Simplify)

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

$\"\"$

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