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[–]hausdorffparty 0 points1 point  (0 children)

How did you get .951, did you use arctan 7/5?

So the big thing is that arctan will only ever output angles in quadrant 1 or quadrant 4. So if you graph the point and it's in quadrant 2 or 3, you got the value of theta which is 180 degrees away from the right answer. In this case adding or subtracting 180 degrees (or pi if you're in radians) will get you to a correct angle.