$\"\"$

The point in rectangular coordinate system is $\"\"$ .

To convert rectangular coordinate system to cylindrical coordinate system, use the conversion equations $\"\"$ , $\"\"$ and $\"\"$ .

Substitute $\"\"$ in the above conversion equations.

$\"\"$

The point in cylindrical coordinate system is $\"\"$ .

$\"\"$

The point in cylindrical coordinate system is $\"\"$ .