Multiple Choice Questions on The area of the ring between two concentric circles whose circumferences are 88 cm and 132 cm is ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

The area of the ring between two concentric circles whose circumferences are 88 cm and 132 cm is ........

Quantitative Aptitude ( CCS) Mensuration 2D
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    The area of the ring between two concentric circles, whose circumferences are 88 cm and 132 cm, is

    780 cm2

    Incorrect Answer

    770 cm2

    Correct Answer

    715 cm2

    Incorrect Answer

    660 cm2

    Incorrect Answer
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    Explanation:


    2πr1 = 132    
    ⇒    r1 = 21 cm
    and,    2πr2 = 88    
    ⇒    r2 = 14 cm
    ∴ Area between two concentric circles
    = πr12 – πr22
    = π(r12 – r22)
    = π(r1 + r2)(r1 – r2)
    = 22/7 × 35 × 7  =  770 cm2

    By: Amit Kumar
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