I assume by you mean the horizontal displacement, and by you mean the vertical displacement. If so, draw a diagram of it. You will end up with a right-triangle (with legs 1.3 and 3.40), use the appropriate trig ratio to find the desired angle, which would end up being the one you were given i believe: , where A is the length of the hypotenuse. remember, you want to describe the angle as the angle obtained by going anti-clockwise from the positive x-axis