已知弦长L=2.8米和弧长C=3.6米求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=1.5
R1=1.504
R2=1.504
R=1.504米