Hello, myoplex11!

The diagonals of a parellelogram are 20 cm and 30cm long

and intersect at an angle of 25°.

Find the sides of the parellelogram.

i used the Law of Cosines to find one of the sides but i am getting the wrong answer.

I let sides and

and got the wrong answer. Where am i going wrong?

It's really hard to see your work from here! .Could you write larger?

Law of Cosines: .

We have: .

Therefore: .