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

  • question_answer
    The difference between the circumference and radius of a circle is 74 m. What is the circumference of the circle.

    A)  \[56\text{ }m\]                       

    B)  \[\text{74 }m\]         

    C)  \[\text{110 }m\]                     

    D)  \[\text{88 }m\]

    Correct Answer: D

    Solution :

    (d):\[C=2\pi r\]     \[\therefore \,C-r=r(2\pi -1)=74\Rightarrow r=\frac{74}{2\pi -1}\] \[\therefore 2\pi r=\frac{74\times 2\pi }{2\pi -1}\,\,\,\,=74\times \frac{44/7}{\frac{44}{7}-1}=74\times \frac{44}{37}=88\,cm\]


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