But here is a hint: "How many degrees are there in a circle? Ok, how many radians are there in a circle?"

If you know these two things you can derive the relationship.

This is basic (8th Grade around here) algebra!!!

By the way, you have a 0.000 average here on EE when it comes to closing questions. Your question from Feb. 2002 is STILL OPEN:

http://www.experts-exchange.com/jsp/qShow.jsp?ta=3dgames&qid=20263123

Please resolve this.