题目内容：

,一段弧 弧长9000 弦长8419 能帮我算下半径吗

优质解答

弧长C=9000,弦长L=8419,求半径R?
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=7000
R1=7150.96
R2=7159.41
R3=7159.44
R4=7159.44
R=7159.44