已知弧长C=860和弧到弦的距离为H=52,求弦长L?弧半径为R,弧所对的圆心角为A.Rn+1=(1-(Rn*COS(C/(2*Rn))-Rn+H)/((C/2)*SIN(C/(2*Rn))-H))*RnR0=1500R1=1698.59R2=1763.78R3=1769.12R4=1769.15R5=1769.15R=1769.15A=C/R...