<P> In geometry, a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line 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 . </P> <P> 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 (of that polygon or polyhedron) if they are adjacent vertices, or otherwise a diagonal . When the end points both lie on a curve such as a circle, a line segment is called a chord (of that curve). </P>

What is a line segment in geometry terms