已知弧长C=3650弦长L=3000求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=1500
R1=1661.01
R2=1712.21
R3=1716.24
R4=1716.26
R5=1716.26
R=1716.26