# Homework Help: Using Shell method to solve Disk method Problem

1. Nov 3, 2012

### barapapupi

1. The problem statement, all variables and given/known data

Use the shell method to find the volume of the area enclosed by:

$y= 16-x^2$ , $y= 16$,$x=4$, around $y=16$

2. Relevant equations

$$2\pi\int (shell height)( shell radius)$$

3. The attempt at a solution

I tried using the disk method and obtained $$\frac{1024}{5}*\pi$$

but I'm having trouble because they as to specifically use the shell method and so far I think the $$shell height = 5 - \sqrt{25-y}$$ , but I have no idea how to get the radius, and is the integration on y=0 to y=25?

EDIT: Nevermind, I found the answer

Last edited: Nov 3, 2012