弧长是C=1025.弦长是L=1017,求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=2000
R1=2249.78
R2=2352.292
R3=2365.331
R4=2365.514
R4=2365.514
R=2365.514