长是L=14米高H=2米弧长C是多少？弧半径为R，弧所对的圆心角为A。R^2=(R-H)^2+(L/2)^2R^2=R^2-2*R*H+H^2+L^2/42*R*H=H^2+L^2/4R=H/2+L^2/(8*H) =2/2+14^2/(8*2) =13.25米A=2*ARC SIN((L/2)/R) =2*ARC SIN((14/2)/13.25) =63.78度C=π*R*A/180=π*13.25*63.78/180=14.75米
