Points, Lines, and Planes
All geometric figures consist of points.
A straight line consists of an infinite number of points; it extends in two directions without ending. Although a picture of a line has some thickness, the line itself has no thickness.
A geometric plane is suggested by a floor, wall, or tabletop. Unlike a tabletop, a plane extends without ending and has no thickness.
In geometry, the terms, point, line, and plane are accepted as intuitive ideas and are not defined. These undefined terms are used in the definitions of other terms.
Find out more about points, lines, and planes by reading the explanation below.
Practice: Answer the following exercises about points, lines, and planes.