SOLUTION: Please help I can t figure this TRIG triangle problem out circles radains? http://i.imgur.com/ENokyqN.png please explain how to solve

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Question 966389: Please help I can t figure this TRIG triangle problem out circles radains?

http://i.imgur.com/ENokyqN.png
please explain how to solve
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A full circle would be 2pi radians.
A%5Bs%5D%2FA%5Bc%5D=0.5%2F%282pi%29
A%5Bs%5D=A%5Bc%5D%2F%284pi%29
A%5Bs%5D=%28pi%2A20%5E2%29%2F%284pi%29
A%5Bs%5D=100