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## Homework Statement

Transform to cylindrical coordinates:

x[tex]^{2}[/tex]+y[tex]^{2}[/tex]=R[tex]^{2}[/tex]

Doesn't look like a problem at all first...

## Homework Equations

.. after all I know that is a circle (2d) and we can forget the z-axis (=0) and transform it to just polar coords.

Also I know, that for polar coordinates

x = r cos[tex]\theta[/tex]

y = r sin[tex]\theta[/tex]

## The Attempt at a Solution

But I don't know how to put it out as an answer. Am I supposed to give a parametric equation in terms of x=... and y=... or should it be like r=... and [tex]\theta[/tex]=... and z=0 or can I express it without parametres?