## The Lesson

The angular coordinate is the second number in the pair of numbers used to describe polar coordinates. For example, in the polar coordinates (5, 45°), angular coordinate is 45° (the number on the right): The angular coordinate is sometimes called the polar angle or the azimuth. It can be measured in degrees or radians.

## What Does the Angular Coordinate Mean?

The angular coordinate tells you what angle the point is (in the counter-clockwise direction) from the polar axis. If a point has polar coordinates (5, 45°), the point would be 45° from the polar axis. The image below shows what we mean by a point being 45° from the polar axis: ## Using a Polar Grid to Find the Angular Coordinate

A polar grid can be used to find the angular coordinate. A polar grid is shown below: A line from the pole is shown in red. If we read along the line, we see that it is labelled 45°. All points on this line are 45° from the polar axis.

## Counter-Clockwise

The angular coordinate is measured in the counter-clockwise (or anti-clockwise) direction: Make sure you do not measure the angular coordinate in the clockwise direction: 