Changes

A '''line segment''' is a finite, unbroken portion of a [[line]].  A line extends infinitely in both directions; a line segment does not extend infinitely in either direction.  Instead, a line segment ends at two points, called the ''end points'' of the line segment. <ref>[http://strader.cehd.tamu.edu/Mathematics/Geometry/PolygonLesson/Details/line_segment.html Texas A&M]</ref>  Alternatively, a line segment can be thought of as "the set of all [[point]]s that lie on the line between" its endpoints.

A '''line segment''' is a finite, unbroken portion of a [[line]].  A line extends infinitely in both directions; a line segment does not extend infinitely in either direction.  Instead, a line segment ends at two points, called the ''end points'' of the line segment.<ref>[http://strader.cehd.tamu.edu/Mathematics/Geometry/PolygonLesson/Details/line_segment.html Texas A&M]</ref>  Alternatively, a line segment can be thought of as "the set of all [[point]]s that lie on the line between" its endpoints.

For example, the real line extends through all the real numbers from negative infinity to positive infinity - it contains every real number.  A line segment of the real line contains all real numbers between two certain points, such as all the real numbers between 4 and 5.  Such a line segment is more commonly known as an interval, [a,b].

For example, the real line extends through all the real numbers from negative infinity to positive infinity - it contains every real number.  A line segment of the real line contains all real numbers between two certain points, such as all the real numbers between 4 and 5.  Such a line segment is more commonly known as an interval, [a,b].