弧长C=8.34m 弦长L=6.3m 求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=3
R1=3.249
R2=3.305
R3=3.308
R4=3.308
R=3.308米