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CBSE Class 9 Answered

If 1 m2 of sheet costs Rs. 400. Find the cost of sheet required to make a closed cylindrical tank of height 1.4 m and base diameter 210 cm.

Asked by Topperlearning User | 12 Oct, 2017, 08:05: AM
Expert Answer

Given: Base diameter of the tank = 210 cm

Then, radius (r) = 105 cm

Height (h) = 1.4 m = 140 cm

Let S denote the total surface area of the tank.

                       

begin mathsize 12px style straight S space equals space 2 πr open parentheses straight r plus straight h close parentheses
straight S space equals space 2 cross times 22 over 7 cross times 105 open parentheses 105 plus 140 close parentheses
straight S space equals space 161700 space cm squared
straight S space equals space 16.17 space straight m squared end style

 

Cost of 1 m2 of sheet = Rs. 400

Cost of 16.17 m2 of sheet = Rs. (400 x16.17) = Rs. 6468

Answered by | 12 Oct, 2017, 10:05: AM
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