Hey Bubbleboy78.

The angle will be arctan(y/x) but it will be in the third quadrant (since both are negative) so you will need to add pi to the result to get the angle in that quadrant.

Your answer given is wrong and using R I get:

> (atan(160.19/0.52) + pi)*(180/pi)

[1] 269.814

or 269.814 degrees counter-clockwise from the real axis, which is in the third quadrant.