已知弧长C=1270拱高H=155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=1300R1=1272.97R2=1274.02R3=1274.02弧半径R=1274.02A=C/R=1270/1274.02=0.996845弧度...