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Concept

Line Segment

A segment, or line segment, is part of a line bounded by two different points, called endpoints. It is made of all the points on the line between the endpoints. Unlike a line, a segment does not extend infinitely, and then it is drawn without arrowheads.
Segment from A to B

As with a line, between two different points there is exactly one segment. A segment with endpoints and is denoted as or while its length or measure is written as or When two segments have the same length they are said to be congruent.

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