1. ## trigonometry

could someone tell me if this problem is correct?

http://i333.photobucket.com/albums/m...g?t=1229051527

Thank you!

2. 140° ? from where is there this information?

3. since side a = 5.9 and side b = 5.9, the angle of A and B are the same. So I subtracted (20 + 20) degrees from 180 degrees which gave me 140 degrees.

4. I see. Following step is unbelievable.
It"s sure that sin(20°)/5.9 < 1 because sin(x)<1 always.

This solution seems me a little confused.