[填空题]
The following diagram shows a circlznyq s-i 5+4 q)yrhq(qe with centre O and radius 8 f + +an2db+1kcdl3xm 4xofe 6vcm.
Points $\mathrm{A}$, $\mathrm{B}$ lie on the circle and $\mathrm{AO} \mathrm{B}=2.7$ radians.
1. Find:
1. the length of the major arc A B ; ≈ cm
2. the perimeter of the shaded region. ≈ cm
2. Find the area of the shaded region. ≈ cm
