Is the radius of the inner circle for this problem ?
The problem is: Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. ,
, , about
This is the image I have (although mine's on paper and it shows the washer's depth decreasing)
I've fiddled around with that a few times, but I feel like I'm now starting to go in circles. I'm hoping I could get an eyeball so I can see what I'm not visualizing correctly. I know that I need the area between y=0 and y, and I assumed the bounds were x=1 and x=5, so I figured I had enough to take the integral with that information.