A plane has two dimensions: length and width.


It is represented by a parallelogram or a quadrilateral.

The angles are named by Greek letters: α (alpha), β (beta) ...

A Plane is Determined by:

Three points that are not aligned.


Two lines that intersect.


Two parallel lines.

Two Parallel Lines

A point and a line.

A Point and a Line

Properties of the Plane

1.A plane contains infinite points.

2.A plane contains infinite straight lines.

3.A plane is unlimited.

4.Two intersecting planes determine a line.

5.A straight line that has two points in the plane is contained in that plain.

6.A straight line passes through infinite planes.




A half-plane is each of the parts that a plane is divided into when intersected by a line or another plain.