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otakuworld

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I attempted the first question and got like halfway but I don't know how to do find volumes of semicircles in integration.
There are 2 questions I'm stuck on for the first image its on the right question b) and 16. Sorry for the bad quality
 

jazz519

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otakuworld

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huh, this was actually how I did it at first but I thought it was wrong. Thanks again I remember you from yesterday! ヾ(☆▽☆)
The answers correct
 

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