From properties of parallelogram the two angles shown added together equal 180 degrees.

Step 1:

The two sides of the parallelogram are $\"image\"$ .

Solve $\"image\"$ , by using cosine rule.

$\"image\"$

Step 2 :

From the properties of parallelogram, the two angles shown added together equals to 180 degrees.

So if one is 45 degrees, the other is 135 degrees.

$\"image\"$

Step 3 :

Solve $\"image\"$ , by using cosine rule.

$\"image\"$

The values of $\"image\"$ .

Solution :

The values of $\"image\"$ .