[填空题]
The following diagram w5wb 9lxii6ofywsb;zn7qp6s 0v60n)v56byj shows a circle withr2 ppejk6jiiz2qznkj )-v981 centre O and radius 8 cm.
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
