Asked by Bob

F1 has a magnitude of 9N acting due west, and F2 has a magnitude of 12 N.
I know the magnitude is 15 but I don't know the angle and how to calculate it. I need a lot of help for calculating resultant angles.
Answered by Steve
well, its angle θ is

tanθ = 12/-9

did you actually try drawing a diagram?

I assume you can convert from the conventional trig angles to compass directions ...