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Take `pi=22/7`
किसी धातु की बेलनाकार पाईप का आयतनप `748cm^(3)` है। पाईप की लम्बाई 14 सेमी. तथा उसकी बाह्य त्रिज्या 9 सेमी. है। पाईप की मोटाई ज्ञात करें?
A. `1 cm`
B. `5.2 cm`
C. `2.3 cm`
D. `3.7 cm`

1 Answer

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Correct Answer - A
According to the question
`pih(R^(2)-r^(2))=748`
`R^(2)-r^(2)=(748xx7)/(22xx14)`
`9^(2)-r^(2)=17`
`implies9^(2)-r^(2)=17`
`impliesr^(2)=81-17=64`
`impliesr=8`
`implies` Thickness `=9-8=1cm`

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