Skip to main content\(\newcommand{\R}{\mathbb{R}}
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\)
A three dimensional plot with axes labeled
\(x\text{,}\) \(y\text{,}\) and
\(z\text{.}\) A half plane is drawn in blue extending from the z-axis in the direction of the axis labeled
\(x\text{.}\) The blue half plane is labeled
\(\theta=0\text{.}\) A half plane is drawn in red extending from the z-axis in the direction opposite the axis labeled
\(x\text{.}\) The red half plane is labeled
\(\theta=\pi\text{.}\) The region of points with a positive y-coordinate is shown in yellow.