Line segment, a general term in technical drawing, refers to a continuous or discontinuous drawing line composed of one or more different line elements, such as a real line segment or a two-point long line segment composed of "long stroke, short interval, point, short interval, point and short interval".
Connect two points with a ruler and you get a line segment. The length of a line segment is the distance between these two points.
The length of the line segment connecting two points is called the distance between these two points.
Line segments are represented by letters A and B or lowercase letters representing their two endpoints. Sometimes these letters also represent the length of the line segment, which is recorded as line segment AB or line segment BA, line segment A .. where A and B represent the two endpoints of the line segment.
1. Find the possible position of the point on the point segment. Usually, the length of a line segment can be expressed by setting elements, and the equation can be listed according to the meaning of the question. When finding the length of a line segment, when the topic involves the proportion or multiple of the length of the line segment, we can usually set an unknown number and solve it by using the idea of equation.
2. When finding the length of a line segment in the problem of line segment division, if no graph is given in the title, all possible situations must be drawn and classified to avoid missing solutions. When finding the length of a line segment, if there is a problem with the ratio of the line segment, it is often used to set an unknown number and use an equation to find the length of the line segment.
3. When dealing with the moving point problem, we should first study the way and route of the moving point. At this time, it can often be used as a graph method, and then it can be judged according to the graph. In the turning-back movement of moving points, the symmetry of line segments and the parity of movement times are very useful, and the problem can be solved by studying the laws between them.
4. When studying the travel problem on the line segment, we should pay attention to distinguish the time nodes in different motion stages. When studying the problem of moving points on line segments, we should pay attention to analyzing whether there are different situations and whether it is necessary to discuss them in categories. The application of one-dimensional linear equation, the distance between two points, and the flexible use of the sum, difference, multiplication and division of line segments are all key points.