"Line, Ray, Line Segment" Preliminary PPT Courseware on Geometric Figures (Lesson 1)

Description

"Line, Ray, Line Segment" Preliminary PPT Courseware on Geometric Figures (Lesson 1)

Part One: Learning Objectives

1. Master the basic fact that "two points determine a straight line" and understand the positional relationship between points and straight lines.

2. Further understand straight lines, rays, and line segments, and be able to express straight lines, rays, and line segments in correct ways. (Key points)

3. Understand the differences and connections between straight lines, rays, and line segments. (Difficulty)

Situation introduction

We have learned line segments, rays and straight lines in elementary school. Which thing in the picture can they correspond to? What characteristics of segments, rays, and straight lines can you recall using the pictures?

Straight line ray segment PPT, the second part of the content: straight line

collaborative inquiry

Question 1 How many straight lines can be drawn past the point O? How many straight lines can be drawn through two points A and B?

Conclusion: There is a straight line through two points, and there is only one straight line.

Briefly: Two points determine a straight line.

practice

If you wanted to fasten a piece of wood to a wall so that it couldn't turn, how many nails would you need? Do you know the basis for this?

Application examples:

Two points determine a straight line, which can be used to explain phenomena in life.

1. When building a wall, a construction worker will insert a wooden stake at each of the two corners and then pull a straight reference line.

2. When planting trees, as long as the positions of two tree pits are determined, the same row of tree pits can be in a straight line.

practice

Determine whether the following statements are correct and correct the incorrect statements:

① A straight line can be expressed as "straight line A";

② A straight line can be expressed as "straight line ab";

③ A straight line can be expressed as "straight line AB" or "straight line BA", or it can also be recorded as "straight line m".

Straight line ray segment PPT, the third part content: ray, line segment

Learning by analogy

Question 1: By analogy with the representation of straight lines, think about how to represent rays?

1. A ray is represented by its endpoint and another point on the ray (the letter indicating the endpoint must be written first) or by a lowercase letter

Denoted as: ray OA (or ray d)

Thinking: Is there a difference between ray OA and ray AO?

Question 2: By analogy with the representation of a straight line, think about how to represent a line segment?

2. Line segment (1) is represented by two uppercase letters indicating the endpoints (2) is represented by a lowercase letter

Denoted as: line segment AB (or line segment BA)

Recorded as: line segment a

Straight line ray segment PPT, part 4: practice in class

1. There are three points A, B, and C in the same plane. Draw a straight line through any two of them. The number of straight lines that can be drawn is ( )

A. 1 B. 2 C. 1 or 3 D. Unable to determine

2. Which of the following expression methods is correct ( )

A. Line segment L B. Straight line ab

C. Straight line m D. Ray Oa

3. Which of the following statements is accurate and standardized ( )

A. Extend straight line AB B. Straight lines AB and CD intersect at point M

C. Extend ray AO to point B D. Straight lines a, b intersect at point m

4. As shown in the figure, three points A, B, and C are on a straight line.

(1) How many straight lines are there in the picture? How to represent them?

(2) How many line segments are there in the picture? How to represent them?

(3) Are ray AB and ray AC the same ray?

(4) How many rays are there in the picture? Write a ray with point B as its endpoint.

Keywords: Free download of PPT courseware for seventh-grade mathematics from the People's Education Press, PPT download of straight lines, rays and segments, preliminary PPT download of geometric figures, .PPT format;

For more information about the "Preliminary Linear Ray Segments of Geometric Figures" PPT courseware, please click the Preliminary Geometric Figures PPT Linear Ray Segments PPT tab.

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"Line, Ray, Line Segment" Preliminary PPT of Geometric Figures (Lesson 1):

"Line, Ray, Line Segment" Preliminary PPT on Geometric Figures (Lesson 1) Part One: Learning Objectives 1. Master the basic facts that two points determine a straight line, and understand the positional relationship between points and straight lines. 2. Further understand straight lines, rays, Line segments will use the correct...

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Update Time: 2024-10-01

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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