Multiple Choice Questions on Find the length of a rope by which a cow must be tethered in order that it may be able to graze an a........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Find the length of a rope by which a cow must be tethered in order that it may be able to graze an a...........

Quantitative Aptitude ( CCS) Mensuration 2D
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    Find the length of a rope by which a cow must be tethered in order that it may be able to graze an area of 9856 sq meters.

    35 m

    Incorrect Answer

    56 m

    Correct Answer

    65 m

    Incorrect Answer

    76 m

    Incorrect Answer
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    Explanation:

    clearly the cow will graze a circular field of area 9856 sq m and radius equal to the length of the rope.
    Let the length of the rope be r mts 
    then, πr2=9856 
    ⇒ r2=(9856×7)/22=3136 
    ⇒r =56m

    By: MIRZA SADDAM HUSSAIN
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