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