1. ## bits n bobs

few little grey areas:

1) how would i work this one out:

find the vloume generated by rotationg the area bounded by y=x^2 and y=4 around the line y=1

2. It is the same as rotating $(x+1)^2$ around $y=0$. Use the volume of rotation formula.

3. Originally Posted by ThePerfectHacker
It is the same as rotating $(x+1)^2$ around $y=0$. Use the volume of rotation formula.

what formula is that?
x

4. $\int_a^b \pi f^2(x)dx$.

5. Originally Posted by Rebesques
$\int_a^b \pi f^2(x)dx$.
It should be,
$2\pi \int_a^b xf(x) dx$

6. I doubt it

This random page says otherwise:

Volume of A Solid of Revolution

Are you talking about surface area maybe?