Skip to main content\(\newcommand{\R}{\mathbb{R}}
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\)
A three dimensional plot with a half plane extending from the axis labeled
\(z\) in the direction of positive
\(y\) and negative
\(x\) axes shown in blue. The blue half plane is labeled
\(\theta with r \gt 0\text{.}\) A red circular arc is drawn in the xy-plane from the axis labeled
\(x\) to the blue half plane and is labeled
\(\theta =2\text{.}\) A green half plane extending from the axis labeled
\(z\) in the direction of negative
\(y\) and positive
\(x\) axes shown in green. The green half plane is labeled
\(\theta with r \lt 0\text{.}\) A pink circular arc is drawn in the xy-plane from the axis labeled
\(x\) to the green half plane and is labeled
\(\theta =2+\pi\text{.}\)