Question

ABCD is a flower bed If OA = 21m and OC = 14m. Find the area of the bed in $m^2$.

• A. 80
• B. 92
• C. 90
• D. 95

Answer 1

The correct option is B

92

Required area = Area of sector OAB – Area of sector OCD
$=\frac{\theta }{360}\times \pi (R^2-r^2)$

$=\frac{90}{360}\times \pi ({21}^2-{14}^2)$

$=\frac{1}{4}\times \pi \left(245\right)$

$=192.5m^2$