弦长L=33,大弧长C=352 求半径R=?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=70
R1=59.17
R2=61.24
R3=61.34
R4=61.34
R=61.34