Question

In polar coordinates, the axis determined by theta=0 is called ?

Answer 1

polar according to APEX for whatever reason

Answer 2

In polar coordinates, the axis determined by theta=0 is called the positive x-axis or horizontal axis.

To add, in mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point and an angle from a reference direction.