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      Question

      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.
      A 2808 Correct Answer Incorrect Answer
      B 3808 Correct Answer Incorrect Answer
      C 4808 Correct Answer Incorrect Answer
      D 5808 Correct Answer Incorrect Answer

      Solution

      By using the above formula, the area of the field β‡’ Ο€r2 = 13.86 Γ— 10000 β‡’ (22/7)r2 = 138600 β‡’ r2 = (7/22) Γ— 138600 β‡’ r2 = 44100 β‡’ r = 210 m Length of circular field = 2Ο€r Length of circular field = 2 Γ— (22/7) Γ— 210 = 1320 m. Hence, the cost of fencing it at the rate of Rs. 4.40 per meter β‡’ 1320 Γ— 4.4 = 5808 ∴ The cost of fencing is Rs. 5808.

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