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7th Class Mathematics Mensuration Question Bank Mensuration (Perimeter & Area)

  • question_answer
    When the circumference and area of a circle are numerically equal, what is the diameter numerically equal to?

    A)  Area                           

    B)  Circumference 

    C)  2n                              

    D)  4

    Correct Answer: D

    Solution :

    (d): \[C=2\pi r\] & \[A=\pi {{r}^{2}}\Rightarrow \] \[2\pi r=\pi {{r}^{2}}\Rightarrow 2r={{r}^{2}}\] \[\Rightarrow \,\,2=r\Rightarrow 4=2r=d,\]hence diameter = 4


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