$\"\"$

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

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The volume of the solid generated revolving about the line $\"\"$ .

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Washer method: $\"\"$ .

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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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Integrate 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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Apply formula: $\"\"$ .

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Apply power rule of integration: $\"\"$ .

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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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The volume of solid is $\"\"$ . $\"\"$

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The volume of solid is $\"\"$ .