\"\"

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The equations are \"\", \"\", \"\" and \"\".

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Method of washer:

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The volume of the solid \"\" is \"\", where \"\" is the cross sectional area of the solid \"\".

\

\"\"

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Outer radius \"\".

\

Inner radius \"\".

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\"\"

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Volume of the solid is \"\" cubic units.

\

\"\"

\

Volume of the solid is \"\"cubic units.