How do I graph using cylindrical coordinates?

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I need to graph the curves $x^2 + y^2 = 4$, and $x^2 + y^2 = 25$ in the cylindrical coordinate system, but I don't know how. I substituted $x$ and $y$ values for their cylindrical counterparts, but I am at a loss for how to find the coordinates for the graph and how to graph it in general.