$\"\"$

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

Method of disk :

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

$\"\"$ .

Radius $\"\"$ .

$\"\"$

$\"\"$ cubic units.

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

$\"\"$

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