Question

3. The radius of a circular park is 18.2 metres. A road 2.5 m wide runs around it. Find the cost of graveling the road at 8 per m².
​

Answer 1

Answer:

Given :

Inner radius = 18.2 m

outer radius = 18.2 + 2.5 = 20.7 m

$\sf \: Area \: of \: road = \pi (20.7^{2} - 18.2^{2} )$

$\sf \: Area \: of \: road = 3.14 \times (20.7^{2} - 18.2^{2} )$

$\sf \: Area \: of \: road = 3.14 \times (97.25 )$

$\sf \: Area \: of \: road = 305.365 \: {m}^{2}$