Plane

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Plane can also refer to airplane.

A plane is a perfectly flat surface extending in all directions. Try to imagine the ceiling of a room, only extended into all directions infinitely. A plane has two dimensions : length and width. All planes are flat surfaces. If a surface is not flat, it is called a curved surface.

In geometry, a plane is made up of an infinite number of lines (or points). It has no thickness.

A plane figure is part of a plane. It is named by the capital letters (e.g. A, B, C, ...X, Y, Z) that are put at its corners.

Mathematicians say two planes can be:

  • Parallel = they never meet.
  • Concurrent = they meet forming a line.
  • Coincident = they are one and the same.

[edit] See Also