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Railways Sample Paper RRB (Group D) Sample Test Paper-1

  • question_answer
    If the circumference of a circle is decreased by 50% then me percentage of decrease in its area is

    A)  25                   

    B)  50

    C)  60                               

    D)  75

    Correct Answer: D

    Solution :

    [d] Circumference \[=2\pi r\](.one variable) The decrease in area \[=-\,50-\,50+\frac{50\times 50}{100}\] \[=-\,75%\]


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