Constricting to an arc? [mx]

ive seen it somewhere before but i dont know where… i dont know the math to have a mc rotate around a central point by constricting to an arc… can someone help me please

[edit]
nevermind i found it on actionscript.org… sorry
[/edit]

[re-edit]
sorry nevermind… i got the fla but there is really no explanation and its really confusing… can anybody recommend a better tute on it? or a different method of achieving it? i have a circle and i want a mc to follow around the edge depending on the mouse position relative to the center of the circle… if that helps any… any help appreciated…
[/re-edit]

Check the Best of Kirupa or the Best of Senocular, there should be something about angles :slight_smile:

thanks but i figured out a way to do it… i had some old fla’s with some angle of mouse to a point code in it… i havent taken trig yet (next year im takin precalc) so i will learn all this stuff for good (hopefully ;)) thanks