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Volume method, having trouble picturing

  1. Oct 7, 2007 #1
    So I know it is the "washer" method...but because the book says it is.

    The region enclosed by [tex]x=y^2[/tex] and [tex]x=y+1[/tex] 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,
  2. jcsd
  3. Oct 7, 2007 #2
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