$\"\"$

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

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The solid is revolving about the line $\"\"$ .

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Washer method:

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

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Where $\"\"$ is outer radius and $\"\"$ is inner radius.

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The outer radius of revolution is $\"\"$ .

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The inner radius of revolution is $\"\"$ .

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Substitute $\"\"$ , $\"\"$ in $\"\"$ .

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$\"\"$

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Integrating between $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ \ \

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$\"\"$

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$\"\"$

\

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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

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$\"\"$

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