圆弧计算：弦长10.52m,弦高12.84m,求弧长?弦长3m,弦高11.84m,求弧长?
问题描述：
圆弧计算：弦长10.52m,弦高12.84m,求弧长?弦长3m,弦高11.84m,求弧长?
答
弦长L=10.52m,弦高H=12.84m,求弧长C?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*H*R+H^2+L^2/42*H*R=H^2+L^2/4R=H/2+L^2/(8*H)=12.84/2+10.52^2/(8*12.84)=7.497mA=2*ARC SIN((L/2)/R)=2*ARC SIN((1...