Multiple Choice Questions on If the radius of a circle is reduced by 50 its area will be reduced by ........ for UPSC EPFO Exam Preparation

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Multiple Choice Questions

If the radius of a circle is reduced by 50 its area will be reduced by ........

Quantitative Aptitude Mensuration 2D
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    If the radius of a circle is reduced by 50%, its area will be reduced by

    This questions was previously asked in
    EPFO APFC (2015)
    View All EPFO Previous Year Papers

    30%

    Incorrect Answer

    50%

    Incorrect Answer

    60%

    Incorrect Answer

    75%

    Correct Answer
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    Explanation:

    Let radius of circle be 'r'.
    Area = πr2
    Now, radius reduced by 50%. So, new radius = r/2 So, new area = π(r/2)2
    So, area reduced by = {(πr2 - π(r/2)2)/ πr2} *100 = (3/4) *100 = 75%

    By: Udit Singla
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