MathematicsThe inner diameter of a circular well is 3.5 m  . It is 10 m  deep. What is the cost of plastering its inner curved surface at Rs. 4 per square meter?

The inner diameter of a circular well is 3.5 m  . It is 10 m  deep. What is the cost of plastering its inner curved surface at Rs. 4 per square meter?


  1. A
    Rs. 400
  2. B
    Rs. 440
  3. C
    Rs. 800
  4. D
    Rs. 880 

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    Solution:

    It is given that,
    The inner diameter of the well = 3.5m  and height of well = 10m.
    Now,
    Radius= diameter 2  .
    Thus, the radius of the well,
    The area of curved surface of well,
    CSA=2πrh
    CSA=2×227×3.52×10
    CSA=110m2
    We know the price of plastering 1m2 = Rs 4.
    Thus, the price of plastering the area's curved inner surface is,
    110×4=Rs 440 Thus, plastering the interior curved surface costs Rs.440.
    Therefore, the correct option is 2.
     
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