# Category:Definitions/Polar Coordinates

This category contains definitions related to Polar Coordinates.
Related results can be found in Category:Polar Coordinates.

Let $P$ be any point different from $O$.

Let a straight line $OP$ be drawn from $O$ to $P$.

The length of $OP$ is called the radial coordinate of $P$, and usually labelled $r$.
The angle measured anticlockwise from the polar axis to $OP$ is called the angular coordinate of $P$, and usually labelled $\theta$.
If the angle is measured clockwise from the polar axis to $OP$, its value is considered negative.