弓形知道弧长C=2360 弓高H=300 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=2300R1=2267.987R2=2268.824R3=2268.825R4=2268.825R=2268.825A=C/R=2360/2268...