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

  • question_answer
    Cost of painting of the circular regions with centre A, B, C and D at Rs.5.00 per sq. cm.

    A) \[\text{Rs}.\text{1232}0.00\]

    B) \[\text{Rs}.\text{3}0\text{8}0.00\]

    C) \[\text{Rs}.\text{616}0.00\]

    D) \[\text{Rs}.\text{154}0.00\]

    Correct Answer: B

    Solution :

    [b] Radius of each circle \[=7cm\]
    \[\therefore \] Area of one circle
    \[=\pi {{r}^{2}}=\frac{22}{7}\times 7\times 7=154c{{m}^{2}}\]
    \[\therefore \]Area of four such circles \[4\times 154=616c{{m}^{2}}\]
    So, cost of painting the circles
    \[=Rs.(5.00\times 616)=Rs.3080.00\]

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