Skip to main content\(\newcommand{\R}{\mathbb{R}}
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A three dimensional plot is shown with the xy-plane highlighted with a gridded gray plane. A point in the positive x,y,z directions is drawn and labeled
\(P=(r,\theta,z)\text{.}\) A green segment is drawn parallel to the z-axis, from the point
\(P\) to the xy-plane and is labeled
\(z\text{.}\) A red segment is drawn from axis labeled
\(x\) to the point where the green segment intersects the xy-plane and is labeled
\(r\text{.}\) A blue circular arc is drawn in the xy-plane from the axis labeled
\(x\) to the red segment.