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[[File:Fotothek df tg 0003359 Geometrie ^ Konstruktion ^ Strecke ^ Messinstrument.jpg|thumb|historical image – create a line segment (1699)]]
{{General geometry}}
In [[geometry]], a '''line segment''' is a part of a [[line (mathematics)|straight line]] that is bounded by two distinct end [[Point (geometry)|points]], and contains every point on the line that is between its endpoints. The [[length]] of a line segment is given by the [[Euclidean distance]] between its endpoints. A '''closed line segment''' includes both endpoints, while an '''open line segment''' excludes both endpoints; a '''half-open line segment''' includes exactly one of the endpoints. In [[geometry]], a line segment is often denoted using a line above the symbols for the two endpoints (such as <math>\overline{AB}</math>).<ref>{{Cite web|title=Line Segment Definition - Math Open Reference|url=https://www.mathopenref.com/linesegment.html|access-date=2020-09-01|website=www.mathopenref.com}}</ref>
Examples of line segments include the sides of a triangle or square. More generally, when both of the segment's end points are vertices of a [[polygon]] or [[polyhedron]], the line segment is either an [[edge (geometry)|edge]] (of that polygon or polyhedron) if they are adjacent vertices, or a [[diagonal]]. When the end points both lie on a [[curve]] (such as a [[circle]]), a line segment is called a [[chord (geometry)|chord]] (of that curve).
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