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Take `pi=22/7`
एक खोखले लोहे का पाईप 21 cm लम्बा तथा उसका बाहरी व्यास 8 cm है। यदि पाईप की मोटाई 1 cm हो तथा लोहे का भार `8gm//cm^(3)` हो तब पाईप का भार ज्ञात करें?
A. `3.696 kg`
B. `3.6 kg`
C. `36 kg`
D. `36.9 kg`

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Correct Answer - A
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खोखले पाइप का आयतन `=pi{R^(2)-r^(2)}xxh`
`=pi{4^(2)-3^(2)}xx21`
`=22/7xx7xx21=22xx21`
`=462cm^(3)`
Now `1cm^(3)=8g`
`462cm^(3)=8xx462g`
`=3696g=3.69kg`

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