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If the external diameter of a pipe is 25...

If the external diameter of a pipe is 25 cm and the thickness is 1 cm , find the total surface area.

Text Solution

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Total surface area=CSA of outside cylinder+ CSA of inside cylinder+2*area of ring.
`=2piRh+2pirh+2pi(r^2-r^2)`
`=2pi(25/2h+23/2h+(25/2+23/2)(25/2-23/2))`
`TSA=48pi(h+1)`.
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