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

  • question_answer
    If the area of a square is same as the area of a circle, then the ratio of their perimeters, in terms of \[\pi ,\] is:     

    A) \[\pi :\sqrt{3}\]

    B) \[2:\sqrt{\pi }\]

    C) \[3:\pi \]

    D) \[\pi :\sqrt{2}\]

    Correct Answer: B

    Solution :

    [b] Let o be the side of the square and r be the radius of the circle.   
    \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{a}^{2}}=\pi {{r}^{2}}\]
    \[\Rightarrow \,\,\,\,\,\,\,\,\,\frac{{{a}^{2}}}{{{r}^{2}}}=\pi \,\,\,\,\,\,\,\Rightarrow \,\,\,\,\,\,\,\,\,\frac{a}{r}=\sqrt{\pi }\]
    Now. required ratio
    \[=\frac{4a}{2\pi r}=\frac{2\sqrt{\pi }}{\pi }=\frac{2}{\sqrt{\pi }}=2:\sqrt{\pi }\]


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