"Ray, Line Segment and Straight Line" Line and Angle PPT Courseware

Description

"Ray, Line Segment and Straight Line" Line and Angle PPT Courseware

teaching objectives

1. Combined with examples in life, experience the process of understanding line segments, straight lines and rays.

2. Be able to distinguish between straight lines, line segments and rays, and be able to draw line segments of specified lengths as required.

3. Be curious about things in life that can be seen as line segments and rays, and stimulate students' interest in learning.

Observe the two pictures and tell me what you found?

Question: Describe in your own words what a bow string looks like.

A taut bowstring can be thought of as a line segment.

Question: Find which objects in the picture can be approximately regarded as line segments.

Question: Can you draw a line segment?

Question: What do you know about line segments?

A line segment is straight, has two endpoints, and has a length.

Question: What will happen if a line segment is extended infinitely to both ends?

Extend a line segment infinitely to both ends to get a straight line.

What is the difference between a straight line and a line segment? what is the relationship?

①A line segment has two endpoints, and a straight line has no endpoints.

②A line segment is a part of a straight line.

③The length of a line segment is limited; a straight line can extend infinitely to both ends.

Question: What will happen if a line segment is extended infinitely in one direction?

A ray is formed by extending a line segment infinitely in one direction.

Question: What are the characteristics of observation rays?

The ray is straight, has an endpoint, and can extend infinitely to one end.

Draw a 4 cm line segment.

(1) Operation steps.

① First click a point, and then use this point as the endpoint to draw a line of specified length along the edge of the ruler in the direction where the scale gradually becomes larger; ② Point the other endpoint of the line segment at the end; ③ The length of the final surface line segment.

The drawn line segment can be recorded as: AB = 4 cm.

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For more information about the PPT courseware "Line and Angle Ray Segment and Straight Line", please click on the line and angle ppt ray segment and straight line ppt tag.

File Info

Update Time: 2024-11-21

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

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