Question

Find the cost of fencing a circular field of 9856 metre square at the rate of ₹ 20 per metre?

Answer 1

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Answer 2

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$area = \pi {r}^{2}$
9856m^2= 22/7×r^2
9856m^2×7/22=r^2
896m^2×7/2=r^2
448m^2×7= r^2
3136m^2=r^2

$\sqrt{3136 {m}^{2} } = radius$
56m=radius

$circuference = 2\pi \: r$

C=2× 22/7×56m
C=44×8m
C=352m

Cost of fencing it= 352×Rs 20=Rs 7040

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