Quadrants

A quadrant is each of the four equal parts that the Cartesian axes divide the plane into.

First Quadrant

The first quadrant is between 0º and 90º.

Sign

Quadrant	Abscissa	Ordinate
First	+	+

Examples

The points A = (1, 2), B = (2, 4) C = (3, 5) and D = (5, 1) are in the first quadrant.

Second Quadrant

The second quadrant is between 90º and 180º.

Sign

Quadrant	Abscissa	Ordinate
Second	−	+

Examples

The points A = (−1, 2), B = (−2, 4) C = (−3, 5) and D = (−5, 1) are in the second quadrant.

Third Quadrant

The third quadrant is between 180º and 270º.

Sign

Quadrant	Abscissa	Ordinate
Third	−	−

Examples

The points A = (−1, −2), B = (−2, −4) C = (−3, −5) and D = (−5, −1) are in the third quadrant.

Fourth Quadrant

The fourth quadrant is between 270º and 360º.

Sign

Quadrant	Abscissa	Ordinate
Fourth	+	−

Examples

The points A = (1, −2), B = (2, −4) C = (3, −5) and D = (5, −1) are in the fourth quadrant.

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