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CBSE Class 9 Answered

An iron pipe 20 cm long has exterior diameter 25 cm. If the thickness of the pipe is 1 cm, find the whole surface area of the pipe.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Total surface area of pipe

= 2Rh + 2rh + 2(R2 - r2)

= 2h(R + r) + 2[(R + r) (R - r)]

= 2(R + r) (h + R - r)

Answered by | 04 Jun, 2014, 03:23: PM

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