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CBSE Class 9 Answered

Find the curved surface area of a 44 m long metal pipe if diameter of its cross section is 4.2 cm.
Asked by Topperlearning User | 12 Oct, 2017, 08:45: AM
answered-by-expert Expert Answer

 

Given: Diameter=4.2 cm ⇒ radius (r) = 2.1 cm

Length (h) =44 m= 4400 cm

 

Let S be the curved surface area of the roller

 

begin mathsize 12px style straight S space equals space 2 πr left parenthesis straight r thin space plus space straight h right parenthesis straight S space equals space 2 cross times 22 over 7 cross times 2.1 space open parentheses 2.1 space plus space 4400 close parentheses straight S space equals space 58107.72 space cm squared end style

 

Answered by | 12 Oct, 2017, 10:45: AM

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