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 direction of the axes labeled
\(y\) and
\(z\) and opposite direction of the axis labeled
\(x\text{.}\) A green segment is drawn parallel to the z-axis, from the point down to the xy-plane and is labeled
\(2\text{.}\) 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. The blue arc is labeled
\(\theta\text{.}\) A pink segment is drawn two units from the origin in the direction opposite the axis labeled
\(x\text{.}\) From the end of the pink segment, there is a dark red segment of length one unit drawn parallel to the axis labeled
\(y\text{.}\)