[填空题]
The following diagram sht nf9l0h ,jd7pows a cq.7a;,v ogwq.w n3xv2lg z:xpircle with centre O and radius 10 cm.
Points $ \mathrm{A}$, $\mathrm{B}$ lie on the circle and $\mathrm{AO}$ $\mathrm{B}=2.2$ radians.
1. Find:
1. the length of the minor arc A B ; cm
2. the perimeter of the shaded region. cm
2. Find the area of the shaded region. $cm^2$
