(iii)

Find $\"\"$ is isosceles or not.

Step 1:

The Parallelogram $\"\"$ has coordinate points $\"\"$ and $\"\"$ .

The points are $\"\"$ and $\"\"$ .

$\"\"$

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

$\"\"$

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

$\"\"$

Since, $\"\"$ then $\"\"$ is isosceles.

Solution :

$\"\"$ then $\"\"$ is isosceles.