Multiple Choice Questions on The area of a circular field is 13 86 hectares Find the cost of fencing it at the rate of Rs 4 40 pe........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The area of a circular field is 13 86 hectares Find the cost of fencing it at the rate of Rs 4 40 pe...........

Quantitative Aptitude ( CCS) Mensuration 2D
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    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.

    2508

    Incorrect Answer

    2638

    Incorrect Answer

    3587

    Incorrect Answer

    5808

    Correct Answer
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    Explanation:

    Area = (13.86 x 10000) sq.m = 138600 sq.m
    πR2=138600
    ⇒R2=138600×7/22
    ⇒R=210m 
    Circumference = 2πR2=2×22/7×210=1320m 
    Cost of fencing = Rs. (1320 x 4.40) = Rs. 5808

    By: MIRZA SADDAM HUSSAIN
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