The Line segment reference article from the English Wikipedia on 24-Jul-2004
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Line segment

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In mathematics, a line segment is a part of a line that is bounded by two end points. See also interval (mathematics).

When the end points both lie on a circle, a line segment is called a chord. When they are both vertices of a polygon, it is an edge if they are adjacent vertices, and otherwise a diagonal.

The midpoint of a line segment is the 'middle' point: the unique point at an equal distance from the two end points.