Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    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.

    ক)
    2808
    খ)
    3808
    গ)
    4808
    ঘ)
    5808

    Explanation

    Area = (13.86 x 10000) sq.m = 138600 sq.m πR2=138600⇒R2=138600×722⇒R=210m\mathrm{πR}^2=138600\Rightarrow\mathrm R^2=138600\times\frac7{22}\Rightarrow\mathrm R=210\mathrm m Circumference = 2πR2=2×227×210=1320m2\mathrm{πR}^2=2\times\frac{22}7\times210=1320\mathrm m Cost of fencing = Rs. (1320 x 4.40) = Rs. 5808

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