In polar coordinates, the positive x-axis is generally referred to as polar axis.
A polar coordinate can be defined as a two-dimensional coordinate system, wherein each point on a plane is typically determined by a distance (r) from the pole (origin or reference point) and an angle (θ) from a reference direction (polar axis).
In Geometry, the positive x-axis is generally referred to as polar axis in polar coordinates because it's a ray from the pole with respect to the reference direction.
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