## Line segment

### A line segment is a part of a line that is bounded by two distinct endpoints

A line segment is a part of a line that is bounded by two distinct endpoints. It can be thought of as the portion of a line that connects two points. The endpoints of a line segment are important because they define its length and determine its position in relation to other line segments or objects.

To represent a line segment, we typically use two capital letters to label its endpoints. For example, if we have a line segment between points A and B, we can denote it as AB or BA, with the order indicating the direction from A to B or from B to A.

The length of a line segment can be calculated by measuring the distance between its endpoints. This can be done using various methods, such as a ruler or a coordinate system. The length is always positive and is denoted by a numerical value.

Line segments are different from lines in that they have finite lengths. A line extends infinitely in both directions, while a line segment only exists between its endpoints.

Line segments can also be classified based on their relative positions or properties. For example, a line segment can be horizontal, vertical, diagonal, or even curved. Additionally, line segments can be congruent (having the same length) or non-congruent, parallel, intersecting, or perpendicular to one another.

In geometry and mathematical analysis, line segments are fundamental components for measuring and analyzing shapes, angles, and distances. They form the basis for constructing polygons, determining lengths of sides, and understanding various geometric relationships.

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