# 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.

## 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.

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