What is the definition of a line segment in Grade Two?

A line segment is a limited part (including two endpoints) between two points on a straight line, which is different from a straight line and a ray.

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.

Features of line segment: limited length, measurable; There are two endpoints; There is symmetry; The straight line between two points is the shortest distance between them.

Application:

In life applications, there are three main types-linking, separating and deleting. Links link the two in different places, as do others, such as indicative supplements.

Separation separates two areas in the same place, as do other areas such as depth of field and equipotential line.

Delete example: When writing an article, in order to save the creative process, the inappropriate sentences are crossed out by lines, as are other stops in the route.