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9th Class Mathematics Surface Areas and Volumes Question Bank Surface Area and Volume

  • question_answer
    What will be the cost to plaster the inner surface of a well 28 m deep and 2 m in radius at the rate of 25 per sq m?

    A)  Rs 4000                       

    B)  Rs 2200           

    C)  Rs 8800  

    D)  Rs 4400

    Correct Answer: C

    Solution :

    (c): Curved surface area of the well \[=2\pi rh\] \[=2\times \frac{22}{7}\times 2\times 28=352\]\[{{m}^{2}}\] \[\therefore \]Expenses of \[352\times 25=8800\]                


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