Plane

From Wikipedia, a free encyclopedia written in simple English for easy reading.

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 very flat piece of land is often called a plane.

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

All planes are flat surfaces. If a surface is not flat, it is called a curved surface.

A plane figure is part of a plane. We name it by the capital letters (e.g. A, B, C, ...X, Y, Z) we put it at its corners.

A plane has two dimensions : length and width

Mathematicians say two planes can be:

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

For more than three, nothing is sure.

Compare: point, line