算圆形
(r-1.35)^2+(10.22/2)^2=r^2
-2.7r+1.8225+26.1121=0
2.7r=27.9346
r=10.346
弧长对的圆心角a=2*arcsin(5.11/10.346)=60°
弧长=La=10.346*兀/3=3.45兀=1.83
值是近似的.
已知弓形弦长10.22米,中心点至弧最高点为1.35米,求弓形弦长
算圆形
(r-1.35)^2+(10.22/2)^2=r^2
-2.7r+1.8225+26.1121=0
2.7r=27.9346
r=10.346
弧长对的圆心角a=2*arcsin(5.11/10.346)=60°
弧长=La=10.346*兀/3=3.45兀=1.83
值是近似的.