已知弦长L=11.7m.弧长C=12.求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=15
R1=15.404
R2=15.433
R3=15.433
R=15.433