Question

A circular garden with radius 42 m is surrounded from outside by a path of 3.5 m wide. Find the cost to pave the stones on the path at the rate of Rs. 20 per m2.

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Answer 1

Answer:

Internal Radius = 21 m, External Radius 21+

3.5 24.5 m

Area of path = π(24.5)² - π(21)²

⇒ π[(24.5)² – (21)²] = 500.5 Cost of travelling = 500.5 x 4 = Rs.2002

Answer 2

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cholly :(

Internal Radius = 21 m, External Radius $21 + 3.5 = 24.5m$

Area of path $\pi {(24.5)}^{2} - \pi {(21)}^{2} \\ ⇒\pi[ {(24.5)}^{2} - {(21)}^{2} ] \\ = 500.5$

Cost of travelling ,

$500.5 \times 4 = Rs.2002$