How to calculate new position in circle

http://img183.imageshack.us/img183/2...tyrevg6.th.jpghttp://img183.imageshack.us/images/thpix.gif

so the area is 100*100 with circle in it, from the centar to the endline of the circle = 50

the first spot is on x=50 y=100 0 degrees
if i set the new angle +45 degrees how do i cancylate x= and y of the new spot?

solwed it (Punch)
if half of circle is 50 in other words "hip = 50"
pi = 3.1415926535897932384626433832795

x = Sin(angle * ( pi / 180) ) * hip
y = Cos(angle * ( pi / 180) ) * hip
and i got new coordinates to use for that angle (Rock)