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) sq.m = 138600 sq.m
πR2=138600⇒R2=138600×722⇒R=210m
Circumference = 2πR2=2×227×210=1320m
Cost of fencing = Rs. (1320 x 4.40) = Rs. 5808.
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