I've been stuck on this question for over 2 hours now. . . I hope you can help me!

The homework question is:

**Find the magnitude and the direction (to the nearest degree) of the resultant of each of the following systems of forces.**

a. forces of 3 N and 8 N acting at an angle of 60º to each other - use geometric vectors to solve this problem **Answer: 9.8 N, 15º to 8N**
I can't find the angle across 8 N or the resultant because I need to know the angle first before I can figure this value.

So my question is, "

**How do you find out the angle across 8 N in the following diagram?**"

The only angle I know is 60º.

**I tried using the sine law, but I can't retrieve the angle to find the right resultant using the cosine law.**