# Plane

A plane is a two-dimensional surface defined by linear equations.

Plane is a high school-level concept that would be first encountered in a pre-calculus course. It is listed in the California State Standards for Grade 7.

### Examples

Complex Plane: | The complex plane is a term for the set of all complex numbers. Just as all real numbers can be imagined as lying on a line, all complex numbers can be thought of as points in a plane. |

### Prerequisites

Line: | A line is the infinite extension in both directions of a line segment, giving the path of shortest distance between two points in Euclidean space. |