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Question

The dome of a building is hemispherical in shape,having radius of 7 m. It has to be painted at Rs.5 per sq. m. Find the total cost of painting the dome.


  1. Rs.720

  2. Rs.1720

  3. Rs.1400

  4. Rs.1540


Solution

The correct option is D

Rs.1540


Cost of painting the dome = Curved surface area of hemisphere × 5

= 5 × 2 πr2= 5 x 308 = Rs.1540

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