What is a Plane in Geometry? Definition and Examples

What is a plane in geometry? In geometry, a plane is a flat surface with the following characteristics:

  • The plane has no thickness
  • The plane extends in all directions without ending.
  • The plane is two-dimensional

The figure below is a plane. The red arrows indicate that the plane extends in all directions without ending.

Plane in geometry

How to name a plane in geometry

You can name a plane by either using at least three of its noncollinear points or by using a single capital letter.

Naming a plane

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