## You are here

Homequadrant

## Primary tabs

# quadrant

The $x$- and $y$-axes divide the $xy$-plane in four right-angle domains which are called the quadrants of the plane. They are numbered going round the origin in anticlockwise direction so that

$\{(x,\,y)\mid x>0,\,\,y>0\}$ |

is the first quadrant,

$\{(x,\,y)\mid x<0,\,\,y>0\}$ |

the second quadrant, and so on.

Naturally, one can speak of the quadrants of the complex plane, too.

Defines:

1st quadrant, 2nd quadrant, 3rd quadrant, 4th quadrant

Related:

RightAngle, ConvexAngle, Octant

Synonym:

quarter-plane

Type of Math Object:

Definition

Major Section:

Reference

Groups audience:

## Mathematics Subject Classification

51N20*no label found*

- Forums
- Planetary Bugs
- HS/Secondary
- University/Tertiary
- Graduate/Advanced
- Industry/Practice
- Research Topics
- LaTeX help
- Math Comptetitions
- Math History
- Math Humor
- PlanetMath Comments
- PlanetMath System Updates and News
- PlanetMath help
- PlanetMath.ORG
- Strategic Communications Development
- The Math Pub
- Testing messages (ignore)

- Other useful stuff
- Corrections