1. The line segment is straight.

2. A line segment has two endpoints.

3. Line segments can measure the length.

Knowledge points of mathematical measurement

1. A ruler is a tool for measuring the length of an object. Commonly used length units are: meters and centimeters. The width of the index finger is about 1 cm, and the arm is about 1 m,1m =100 cm =1m. ..

2. The measurement unit of shorter objects is usually centimeters, and the measurement unit of longer objects is usually meters.

3. When measuring the length of the object: aim the "0" scale of the ruler at the left end of the object, and then see how many centimeters the right end faces the scale. Object length = large number-decimal number.

4. The line segment is straight and its length can be measured.

Drawing method of line segment

Firstly, determine an endpoint, and then align it with the 0-ruled line of the ruler; Finally, find the corresponding scale, determine the other endpoint, and connect; Draw a line segment.

Application of line segment

In life applications, there are three main types-linking, separating and deleting.

1. links link the two in different places, as do other indicative supplements.

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

3. Delete examples: When writing an article, in order to keep the creative process, cross out inappropriate sentences with lines, as do other stops in the route.