## Line segment

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

A line segment is a part of a line that is bounded by two distinct points. It consists of these two points and all the points lying between them. A line segment is named using its two endpoints, with the endpoint on the left usually being mentioned first.

To understand a line segment, it’s important to distinguish it from a line. While a line extends infinitely in both directions, a line segment has a finite length. It has a definite start point and end point, giving it a measurable length.

Using geometry notation, a line segment can be represented by two points with a line segment symbol on top. For example, if A and B are the two endpoints of a line segment, it can be denoted as AB, with a line segment symbol above AB.

To find the length of a line segment, you can use the distance formula, which is derived from the Pythagorean theorem. If the coordinates of the endpoints are (x1, y1) and (x2, y2), the formula for the length of a line segment AB is:

AB = √((x2 – x1)^2 + (y2 – y1)^2)

This formula calculates the horizontal and vertical distances between the points and then finds the Euclidean distance using the Pythagorean theorem.

Line segments have various applications in mathematics, such as in geometry, trigonometry, and coordinate geometry. They are used to define shapes, determine distances, and establish relationships between different points or objects.

Overall, a line segment is a fundamental concept in mathematics that helps us understand and work with the physical representation of a portion of a line.

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