Explore Plane on MathWorld

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.


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.


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.

Classroom Articles on Pre-Calculus (Up to High School Level)

  • Asymptote
  • Logarithm
  • Complex Conjugate
  • Natural Logarithm
  • Complex Number
  • Normal Vector
  • Conic Section
  • Parabola
  • Cross Product
  • Parametric Equations
  • Curve
  • Plane Curve
  • Determinant
  • Polar Coordinates
  • Domain
  • Range
  • Dot Product
  • Rational Function
  • e
  • Reflection
  • Ellipse
  • Rotation
  • Exponential Function
  • Rotation Matrix
  • Function
  • Scalar
  • Hyperbola
  • Spherical Coordinates
  • i
  • Tangent Line
  • Imaginary Number
  • Translation
  • Inverse Function
  • Vector
  • Locus