Shell Method

Can't wrap my head around the concept of finding the shell radius and shell height, when revolving around a line such as y=2. Any help?

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  1. here it is about y=0. So the radius will be from y=y0 to y.
    https://www.khanacademy.org/math/ap-calculus-ab/ab-applications-definite-integrals/ab-shell-method/v/shell-method-for-rotating-around-horizontal-line
    see if that helps.

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    bobpursley

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