L=170cm,H=22cm
弧半径为R,弧所对的圆心角为A,弧长为C.
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*R*H+H^2+L^2/4
2*R*H=H^2+L^2/4
R=H/2+L^2/(8*H)
=22/2+170^2/(8*22)
=175.205cm
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((170/2)/175.205)
=58.044度
C=π*R*A/180=π*175.205*58.044/180=177.49cm
L=170cm,H=22cm
弧半径为R,弧所对的圆心角为A,弧长为C.
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*R*H+H^2+L^2/4
2*R*H=H^2+L^2/4
R=H/2+L^2/(8*H)
=22/2+170^2/(8*22)
=175.205cm
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((170/2)/175.205)
=58.044度
C=π*R*A/180=π*175.205*58.044/180=177.49cm