Geometric figures are shapes composed of points, lines, or planes. A **point** is simply a location in space; it does not have any dimensional properties such as length, area, or volume. Points are written as a single capital letter, such as *A* or *Q*.

A collection of points that extends infinitely in both directions is a **line**. Points that extends infinitely in only one direction is a **ray**. A section of a line with a beginning and end is a **line segment**. A line segment is described by the beginning and end points, such as line segment *AQ*. Lines, rays, and line segments are examples of **one-dimensional objects** because they can only be measured in one dimension (length).