In
geometry, a line segment is a part of a
line that is bounded by two end
points, which have a finite length, and contains every point on the line between its end points. Examples of line segments include the sides of a triangle or square. More generally, when the end points are both vertices of a
polygon, the line segment is either an
edge (of that polygon) 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).
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