# Volume method, having trouble picturing

1. Oct 7, 2007

So I know it is the "washer" method...but because the book says it is.

The region enclosed by $$x=y^2$$ and $$x=y+1$$ revolved around the y-axis.

Now I think I see it , but is it a "hollow" washer because my bounds y=-1 and y=2 (where the curves intersect) are not ON the axis, thus my coss sections are not disks....

that is to say "the region between the points of intersection and the y axis does not get "swept out" during the revolution"...

I know this is tricky without a diagram,
thanks,
Casey

2. Oct 7, 2007