弦到圆心的距离= √（6.472^2-(4.48/2)^2)=6.072
该段弧长所对的圆心角为 θ = 2arcsin(2.24/6.472)=40.5 度.
所求弧长=π×6.472×2×40.5/360=4.572
弦到弧顶的面积=π×6.472^2×40.5/360-4.48×6.072/2=1.195