how do i find a point on an arc/curve given the center(x,y) ?

[Zombie]

as the subject says, how do i calculate (x,y) points on a curve given the center(x,y). I have the beginning(x, y) and the end(x, y) also but unfortunatly don't know what angle is the arc taking? I know there is formula but don't have anything to refer to. So can somebody help ?

thanks

 

[Moonbeam]

If it's the arc of a circle, which it seems it must be, then you know the formula. Just to be simple minded, I would translate the center points to x=0 y=0 and similarly the starting values of the arc. I would then calculate the radius. And so on.