"Comparison of Line Segment Length" PPT Courseware

Description

"Comparison of Line Segment Length" PPT Courseware

Review old knowledge

The essential difference between line segments, rays, and straight lines is that _____ has no endpoints, _____ has only one endpoint, and _____ has two endpoints.

The basic property of a straight line is: there is only one straight line passing through two points.

Among line segments, rays, and straight lines, ____ can measure length, so only ____ can compare length.

discuss

How to compare the height of two people?

What inspiration did you get from this to compare the length of two line segments?

Comparison of line segments:

The first method is: measurement method, that is, use a ruler to measure the length of two line segments and then compare them.

The second method is: superposition method

First, overlap one end of the two line segments, the other end falls on the same side, and compare the length according to the position where the other end falls.

give it a try

The two line segments drawn on the blackboard cannot be moved. In the absence of measurement tools, please think of a way to compare their lengths?

①Observation method

②With the help of an object, such as a pencil, a small wooden stick, etc.

Do it

1.(1) Use a scale to measure the lengths of the three sides of the triangle in the picture:

AC=＿＿cm; BC=＿＿cm;

AB=＿＿cm.

(2) Use "=", "<" or ">" to fill in the following spaces:

AC___BC,

AC___AB,

AB___BC.

Give it a try:

1. Judgment question

(1) Two line segments can be compared in size, but straight lines cannot be compared in size. ( )

(2) A line segment is a figure, and the length of a line segment is a quantity. ( )

(3) The only method for comparing the size of line segments is the measurement method. ( )

summary

What is your biggest gain from this class?

1. How to compare the length of line segments:

(1) Estimation method

(2)Measurement method

(3) Superposition method

2. Among all the lines connecting two points, the line segment is the shortest.

3. The length of the line segment between two points is called the distance between the two points.

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For more information about the "Comparison of Line Segment Lengths" PPT courseware, please click on the "Comparison of Line Segments Lengths" ppt tab.

"Comparison of Line Segment Length" PPT Courseware 2:

"Comparison of Line Segment Lengths" PPT Courseware 2 Test your eyesight. Which one is longer, line segment AB or line segment CD? How many methods do you have to compare the lengths of two line segments? 1. You can use a ruler to measure the lengths of the two line segments respectively, and then Compare. Measurement method. 2. Two line segments can be superimposed..

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Update Time: 2024-10-17

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 1 industry PPT template

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