Line
A set of points that are endless in both directions.
Point
An exact position
Line segment
Part of a line. It has two end points.
Ray
Part of a line that extends forever in one direction. It has one endpoint.
Intersecting lines
Lines that cross at one point.
Perpendicular lines
A pair of intersecting lines that form a 90 degree angle.
Parallel lines
A pair of lines that never cross.