求教已知弧长,弦长,求弓形面积!急等!

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已知弧长C,弦长L,求弓形面积S?
弧半径为R,弧所对的圆心角为A.用下式来求得R
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
A=C/RS=π*R^2*A/(2*π)=R^2*A/2