# Math Help - Problem Finding Volume of Revolution

1. ## Problem Finding Volume of Revolution

Hello,
I have worked this question on finding the volune of revolution.. but i think there is something wrong..
I have posted the question + my works up to the answer.

Can anyone check it and let me know if its good please?
I have to submit it in 12 hours time.

The question:

Should i use this formula ?if yes how do i apply it here...

Formula:

2. you did everything fine until the very end ... you added when you should have subtracted.

3. Hello.. where i have added instead of subtracted please?

I cant figure it out..
thx

4. $1041.667 - 625 \neq 1666.667$

5. ohhhhhhhhhhh...
lol ..
thanks a lot man :P

thx..
problem solveD:P