hey there all,

ok, not really a ruby question, but did not know where to look.
i have a circle on a graph paper.
if i know the x and y of a point on the graph, if the center is at
0,0, and i know the radius,
how can i find the angle that the point will be on the circumference?
somewhere between 1-360.

would appreciate any tips, thanks
ok, if it is really against the grain to post this question here,
anyone have a recommendation of where to put it?
thanks all

sk