Or the angle was ?
My mistake sorry, why cant you work out the angle?
I never seen notations like 0x 0y? does that mean..0x = along the x-axis?
If you worked out the resulting force just draw a picture.
Use the tip to tail method with the vector and you should be able to calculate the angle. You will have to sides and a right angle triangel.
Assuming you have a vector along the x-axis and one along the y-axis + your vector R (split inte its components).
I got a bit confused by the notations you are using 0x;0y sorry if I missread the question..?Did I?
Hope it helped otherwise