Step 1:

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

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

Washer method:

$\"\"$

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

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

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$ .

$\"\"$

Integrate between 1 and 3.

$\"\"$

Apply formula $\"\"$ .

$\"\"$

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

Solution:

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