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Concept

Quadrants

In a coordinate plane, the intersection of the axis and the axis produces four regions called quadrants. The quadrants are numbered counterclockwise from the top right quadrant as Quadrant I to Quadrant IV in the bottom right.
Quadrants labeled on a coordinate plane.

The signs of the coordinates of a point can be determined based on which quadrant the point lies in.

Quadrants labeled on a coordinate plane.
Conversely, the quadrant of a point can be found by looking at the signs of its coordinates.
Points on an axis do not belong to any quadrant.