The area of a circular field is 13.86 hectares. Find the cost of fencing it at the rate of Rs. 4.40 per metre.
Correct Answer: Option D
Area = (13.86 x 10000) sq.m = 138600 sq.m
\(\mathrm{πR}^2=138600\Rightarrow\mathrm R^2=138600\times\frac7{22}\Rightarrow\mathrm R=210\mathrm m\)
Circumference = \(2\mathrm{πR}^2=2\times\frac{22}7\times210=1320\mathrm m\)
Cost of fencing = Rs. (1320 x 4.40) = Rs. 5808
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