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

Method of washer :

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

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