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

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

$\"\"$

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.

$\"\"$

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

$\"\"$

The values of $\"\"$ and $\"\"$ .

\ $\"\"$ \

The values of $\"\"$ and $\"\"$ .