弦长L=185,弧长C=192,求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=200
R1=203.92
R2=204.12
R3=204.12
半径R=204.12