$\"\"$

\

The radius of the sphere is $\"\"$ .

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$\"\"$

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Observe the diagram:

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The outer radius of the right circular cone is $\"\"$ .

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The limits of the cone are $\"\"$ to $\"\"$ .

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Disk method:

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

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Substitute $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The volume of the sphere is $\"\"$ .

\

$\"\"$

\

The volume of the sphere is $\"\"$ .