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.
Area = (13.86 x 10000) `m^2` = 138600`m^2`.
`pi R^2` = 138600`
`hArr R^2 = (138600 xx 7/22)`
`hArr ` R = 210 m.
Circumference = `2 pi R = (2 xx 22/7 xx 210)` m = 1320 m.
`:.` cost of fencing = Rs. (1320 x 4.40) =Rs. 5808
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