Question

please help me..........

Answer 1

Given
Radius of big sector =7cm
Radius of small sector=3.5

Area of big sector=
$\frac{ \alpha }{360} \times \pi {r}^{2}$
=
$\frac{30}{360} \times \frac{22}{7} \times 7 \times 7$
=
$\frac{462}{36} {cm}^{2}$
=12.83cm²

Area of small sector =
$\frac{30}{360} \times \frac{22}{7} \times 3.5 \times 3.5$
=3.208cm²

Shaded area =12.83-3.208=9.625cm²