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A line segment is a part of a line that has two endpoints and a fixed length. It is different from a line that does not have a beginning or an end and which can be extended in both directions. In this lesson, we will learn more about a line segment, its symbol, and the way to measure a line segment. What is a Line Segment?A line segment is a path between two points that can be measured. Since line segments have a defined length, they can form the sides of any polygon. The figure given below shows a line segment AB, where the length of line segment AB refers to the distance between its endpoints, A and B. Line Segment SymbolA line segment is represented by a bar on top which is the line segment symbol. It is written as \(\overline{AB}\). How to Measure Line Segments?Line segments can be measured with the help of a ruler (scale). Let us see how to measure a given line segment and name it PQ.
Line Segment FormulaIn the above example, we measured the length of line segment PQ to be 4 inches. This is written as \(\overline{PQ}\) = 4 inches. Now, let us see how to find the length of a line segment when the coordinates of the two endpoints are given. In this case, we use the distance formula, that is, D = √[(\(x_{2}-x_{1}\))2 + (\(y_{2}-y_{1}\))2]. Here, (\(x_{1}\), \(y_{1}\)) and (\(x_{2}\), \(y_{2}\)) are the coordinates of the given points. For example, a line segment has the following coordinates: (-2, 1) and (4, –3). Let us apply the distance formula to find the length of the line segment. Here, \(x_{1}\) = -2; \(x_{2}\) = 4; \(y_{1}\) = 1; \(y_{2}\) = -3. After substituting these values in the distance formula we get: D =√[(4-(-2))2 + (-3-1)2) = √((4+2)2 + (-3-1)2] = √(62 + (-4)2) = √(36 + 16) = √52 = 7.21 units. Therefore, using the distance formula, we found that the length of the line segment with coordinates (-2, 1) and (4, –3) is 7.21 units. Difference Between Line, Line Segment, and RayObserve the figures given below to understand the difference between a line, a line segment, and a ray.
Important Notes
☛Topics Related Check out the following pages related to the line segment.
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FAQs on Line SegmentA line segment is a part of a line that connects two points which are considered to be its endpoints. It is the distance between two points that can be measured. Since line segments have a defined length, they can form the sides of any polygon. What is the Difference Between a Line and a Line Segment?A line has no endpoints and can be extended in both ends, whereas, a line segment has two fixed endpoints, and a ray has just one starting point but no endpoint. How to Draw a Line Segment?To construct a line segment of any length, there are mainly two methods. One is using a ruler and the other is using a ruler and a compass. The first method of constructing a line segment is simple in which we take a ruler (scale) and mark the starting point as P, then we need to mark the endpoint as Q, with the required length of the line segment. For example, if the required length is 4 inches, we mark Q at 4 inches with the help of the ruler. After this step, the two points are joined together which shows the line segment of the desired length. Visit the Methods to Draw a Line Segment page for a detailed explanation. What is the Midpoint of a Line Segment?The midpoint of a line segment refers to a point that divides it into two equal parts and is located in the middle of the line segment. How to Find the Midpoint of a Line Segment?The midpoint of a line segment can be calculated if the coordinates of the endpoints are given. For example, if (x1, y1) and (y1, y2) are the two endpoints, then the midpoint of the line segment can be calculated by the formula, Midpoint = [(x1 + x2)/2, (y1 + y2)/2] What are the Examples of Line Segments in Real Life?We know that line segments have a fixed length or measure. Thus, the examples of line segments in real life include sides of a polygon, edges of a ruler, edges of a paper, etc. What is the Symbol of a Line Segment?A line segment is denoted by a bar on top (—) like \(\overline{AB}\). This bar is considered as the line segment symbol. How to Find the Length of a Line Segment?In order to find the length of a line segment, we use a scale (ruler) to measure its dimensions. In some cases, if the coordinates of the endpoints of the line segment are given, then we apply the distance formula, D = √[(\(x_{2}-x_{1}\))2 + (\(y_{2}-y_{1}\))2], where "D" is the distance between the endpoints of the line segment and (\(x_{1}\), \(y_{1}\)) and (\(x_{2}\), \(y_{2}\)) are the coordinates of the two points. When are Line Segments Congruent?Two figures are said to be congruent if they are of the same size and shape. Thus, any two line segments can be considered to be congruent if they are of the same length. Can a Line Segment be Extended?No, a line segment cannot be extended because it has a fixed and definite length. Although a line can be extended in two opposite directions indefinitely, and a ray can also be extended from one end. |