When given an angle  with polar coordinates, it is necessary to know the position of the polar axis.

While the polar axis is usually a horizontal line drawn to the right, or due east, it can be drawn in any direction.

Thus, an angle of 135° drawn relative to the polar axis can face any direction if the polar axis is not specified.

Observe the figure, the polar axis can be in any direction if not specified. \ \

If the polar axis is specified, it can refer to a wrong rectangular coordinates.

Since quadrant bearings are determined in relation to the directions north and south, they are universally understood.

For example, 45° west of north will always be in the same position.

Direction of the polar axis is specified for the quadrant bearing. \ \