Posted by matrix school 2 on Thursday, August 13, 2009 at 12:16pm.
You want to find volume. Are you rotating the region around a line, such as the x axis, or using cross sections?
dx pi y^2 from x = 0 to 5
pi dx (x^4 )
pi x^5/5
pi (625)
so I get 625 pi if we are spinning around the x axis
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