已知弧长C=9000弦长L=8960求直径D?
弧半径为R.
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=27556
R1=27538.34
R2=27538.37
R3=27538.37
R=27538.37
D=2*R=2*27538.37=55076.74