$\"\"$

The volume $\"\"$ of a right circular cylinder is $\"\"$ .

Where

$\"\"$ is height of a right circular cylinder.

$\"\"$ is the radiusof a right circular cylinder.

Since height is twice of the radius, $\"\"$ .

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

$\"\"$

Volume $\"\"$ of a right circular cylinder as a function of $\"\"$ as $\"\"$ . $\"\"$

Volume $\"\"$ as a function of $\"\"$ as $\"\"$ .