已知弦长为2米,弦高为0.6米,求弧长?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)=0.6/2+2^2/(8*0.6)=1.133米A=2*ARC SIN((L/2)/R=2*ARC SIN((2/2)/1.133...