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7th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    If the radii of two concentric circles are 15 cm and 13 cm respectively, then the area of the circulating ring in sq. cm will be

    A) 176            

    B) 178

    C) 180                             

    D) 200

    Correct Answer: A

    Solution :

        R = 15 cm, r = 13 cm. Area of the circulating ring \[=\pi \left( R+r \right)\left( R-r \right)\] \[=\frac{22}{7}(15+13)\times (15-13)\] \[=\frac{22}{7}\times 28\times 2=176\,\text{sq}\text{.}\,\text{cm}\text{.}\]                      


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