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# C3 Volume of revolution watch

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1. Can't do 10a

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2. (Original post by The_Blade)
Can't do 10a

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Everything you've written down so far is correct. Now use your calculator to find the value of:

3. Get 896/15 pi but book says 10 and 2/3

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4. (Original post by The_Blade)
Get 896/15 pi but book says 10 and 2/3

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I also get that.

As the question suggests. I don't agree with the 10 and 2/3 that the book says.
5. (Original post by The_Blade)
Can't do 10a

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Are you asking about 10a (area) or 10b (volume)
6. (Original post by Khallil)

As the question suggests. I don't agree with the 10 and 2/3 that the book says.
Well you are incorrect

Is the answer - you seem to be finding the solution to 10b
7. (Original post by TenOfThem)
Well you are incorrect

(Original post by TenOfThem)
You seem to be finding the solution to 10b
I am indeed. That's because I looked past part a of the question that was posted and turned my attention to the incomplete working out the OP had written for 10b.
8. (Original post by Khallil)
I am indeed. That's because I looked past the question that was written down and turned my attention to the incomplete working out the OP had posted for 10b.
yep - easily done
9. The book says 10a) 10 and 2/3 and there is no answer for 10b.

I'm confused.

Mind you the book normally don't give answers for 'show that' questions.

So if I accidentally did B how do you do part a?

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10. (Original post by The_Blade)
The book says 10a) 10 and 2/3 and there is no answer for 10b.

I'm confused.

Mind you the book normally don't give answers for 'show that' questions.

So if I accidentally did B how do you do part a?

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You find the area under the curve - like you were taught in C2
11. (Original post by TenOfThem)
You find the area under the curve - like you were taught in C2
Thanks again Ten

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12. (Original post by The_Blade)
Thanks again Ten

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NP
13. (Original post by The_Blade)
The book says 10a) 10 and 2/3 and there is no answer for 10b.

I'm confused.

Mind you the book normally don't give answers for 'show that' questions.

So if I accidentally did B how do you do part a?

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There isn't an answer for 10b because the answer's given in the question. It says "show that..." not "find..."
14. (Original post by TenOfThem)
NP
>5

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