发布网友 发布时间:2024-10-24 06:36
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热心网友 时间:2024-10-27 13:56
一个弓形,弧长C=21米,弓高H=1米,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))*Rn R0=50R1=54.141R2=54.934R3=54.958R4=54.958 R=54.958米A=C/R =21/54.958 =0.38211弧度 =0.38211*180/PI =21.度L=2*R*SIN(A/2) =2*54.958*SIN(21./2) =20.872米