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10th Class Mathematics Areas Related to Circles Question Bank MCQs - Areas Related to Circles

  • question_answer
    If the circumference of a circle increases from \[4\pi \]to \[8\pi \], then its area is:

    A) halved

    B) doubled

    C) tripled

    D) quadrupled 

    Correct Answer: D

    Solution :

    [d] \[2\pi r=4\pi \]
    \[r=2\]
    Area \[=\pi {{(2)}^{2}}=4\pi \]            
    When, \[2\pi r=8\pi \]
    \[r=4\]
    \[\therefore \]      Area \[=16\,\pi \]


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