10th Class Mathematics Areas Related to Circles Question Bank Case Based (MCQs) - Areas Related to Circles

  • question_answer
    The outer perimeter of the lawn is:

    A) \[86\,m\]

    B) \[114\,m\]

    C) \[130\,m\]

    D) \[172\,m\]

    Correct Answer: A

    Solution :

    Outer perimeter of the lawn \[=2l\]Length of rectangle +Circumference of semi-circular ends
    \[=2\times \left( l+\frac{1}{2}\times 2\pi {{r}^{2}} \right)\]
    \[=2\times \left( 21+\frac{22}{7}\times 7 \right)=2\times 43=86m\]
    So, option [a] is correct.

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