The area of a circular field is 13.86 hectares . The cost of fencing it at the rate of 20 paisa per meter is?

Q: The area of a circular field is 13.86 hectares . The cost of fencing it at the rate of 20 paisa per meter is?

∵ 22/7 x r2 = 13.86 x 10000 ⇒ r2 = (13.86 x 10000 x 7) / 22 ∴ r = 210 m ⇒ Circumference = [2 x (22/7) x 210 ] m = 1320 m Cost of fencing = Rs. (1320 x 20)/100 = Rs . 264

Rs. 277.20
Rs. 264
Rs. 324
Rs. 198

Correct Answer: Rs. 264

Explanation:

∵ 22/7 x r² = 13.86 x 10000
⇒ r² = (13.86 x 10000 x 7) / 22
∴ r = 210 m
⇒ Circumference = [2 x (22/7) x 210 ] m
= 1320 m
Cost of fencing = Rs. (1320 x 20)/100
= Rs . 264

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