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CBSE Class 8 Answered

A metallic pipe is 0.7 cm thick. Inner radius id 3.5 cm and length is 5 dm. Find its total surface area.  
Asked by preetiwalia800 | 19 Feb, 2019, 11:20: AM
answered-by-expert Expert Answer
Thickness of pipe = h = 0.7 cm
Inner radius = r = 3.5 cm
External radius = R = r + h = 3.5 + 0.7 = 4.2 cm
Length = 5 dm = 50 cm
Total surface area of cylinder or pipe = 2∏(r + R) (h + R - r)
                                                      = 2 × 22/7 × (3.5 + 4.2) (50 + 4.2 - 3.5)
                                                      = 2453.88 cm2
Answered by Sneha shidid | 20 Feb, 2019, 09:12: AM

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