$\"\"$

The equation is $\"\"$ .

It is a circle of radius $\"\"$ on the $\"\"$ - plane.

$\"\"$ is not in the equation so it can be any real number which means the circle extends toward inifinity in both directions parallel to the $\"\"$ -axis, forming the shape of an infinite cylinder.

$\"\"$ is a cylinder of radius $\"\"$ whose axis is $\"\"$ -axis.

$\"\"$

$\"\"$ is a cylinder of radius $\"\"$ whose axis is $\"\"$ -axis.