[填空题]
On the diagram belowcrre4gp 4xn a k5a1o*., points X and Yp n8 5up5fic.ix8 .woe are the centres of two circles containing the two arcs from A to B.
8ci8. u55 p .nxewpiof
1.Find the length from point A to point Y. mm
2.Find the perimeter of the shaded region. mm
3.Find the area of the shaded region. $mm^2$