已知弧长C=3163,拱高H=150,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=8000R1=8289.54R2=8311.9R3=8312.02R4=8312.02R=8312.02A=C/R=3163/8312.02=0.3805...