Question

If $r_1=9cm$ and $r_2=5cm$, then find the area of the shaded region. (Use $\pi =\frac{22}{7}$)

• A. 176

Answer 1

The correct option is A 176
Given,
Radius $r_1=9cm$
Radius $r_2=5cm$
$Areaofthecircle=\pi r^{2}c{m}^2$

$Areaofthecircle=\pi r_1^2$
$=\pi 9^{2}c{m}^2$
$=81\pi c{m}^2$

$Areaofthecircle=\pi r_2^2$
$=\pi 5^{2}c{m}^2$
$=25\pi c{m}^2$

$Areaoftheshadedregion=81\pi c{m}^2-25\pi c{m}^2=56\pi c{m}^2$
$=\frac{22}{7}\times 56c{m}^2$
$=176c{m}^2$