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CBSE Class 9 Answered

A cylindrical pillar is 49 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of Rs 100 per m2
Asked by Topperlearning User | 12 Oct, 2017, 08:50: AM
answered-by-expert Expert Answer

diameter of the cylindrical pillar = 49 cm⇒ radius (r) = 24.5 cm

Height (h) = 3.5 m=350 cm

Let S denote the curved surface area of the pillar.

 begin mathsize 12px style straight S space equals space 2 πrh straight S space equals space 2 cross times 22 over 7 cross times 24.5 cross times 350 straight S space equals space 53900 space cm squared straight S space equals space 5.39 space straight m squared end style

 

Cost of painting 1 m2 = Rs 100

Cost of painting 5.39 m2= Rs (5.39×100) = Rs 539

Answered by | 12 Oct, 2017, 10:50: AM

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