已知弧长C=15,弦长L=14 求圆半径R!
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=10
R1=11.214
R2=11.684
R3=11.737
R4=11.738
R5=11.738
圆半径R=11.738