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

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"Line, Ray, Line Segment" Preliminary PPT of 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)

Straight line ray segment PPT, part 2: introduction of new knowledge

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?

Thinking: How many straight lines can be drawn past the point O? How many straight lines can be drawn through two points A and B? Give it a try

After thinking and drawing pictures, we can come to a basic fact

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

Briefly: Two points determine a straight line.

Straight line ray segment PPT, the third part: analysis of examples

1. As shown in the figure, what methods can be used to represent the following straight lines?

Summary of key points: Methods of expressing straight lines

① Use a lowercase letter, such as a straight line;

② Indicated by two capital letters. Note: The order of these two capital letters can be exchanged.

2. Observe the picture below and talk about the positional relationship between points and straight lines.

As shown in the figure: point O is on the straight line l (the straight line l passes through the point O), and point P is outside the straight line l (the straight line l does not pass through the point P)

3. As shown in the figure, what is the positional relationship between straight line a and straight line b?

Lines a and b intersect at point O

When two different straight lines have a common point, we say that the two straight lines intersect, and this common point is called their intersection point.

Straight line ray segment PPT, part 4 content: analogy learning

Question 1. Analogous to 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

Noted 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 segments (1) are represented by two capital letters indicating the endpoints

(2) Represented by a lowercase letter

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

Recorded as: line segment a

The relationship between straight lines, rays, and line segments:

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

2. A straight line is formed by extending the line segment infinitely in two directions.

3. Line segments and rays are both parts of a straight line.

Straight line ray segment PPT, part 5: for training

1. Judgment:

(1) A ray is a part of a straight line. ( )

(2) A line segment is a part of a ray. ( )

(3) Draw a ray so that its length is 3cm. ( )

(4) Line segment AB and line segment BA are the same line segment. ( )

(5) Ray OP and ray PO are the same ray. ( )

(6) As shown in the figure, draw a line segment ab. ( )

2. Use appropriate sentences to describe the relationship between points and straight lines in the graph.

3. As shown in the figure, there are four points A, B, C, and D on the plane. Draw the picture according to the following sentences:

(1) Do ray BC;

(2) Connect line segments AC and BD to intersect at point F;

(3) Draw straight line AB and intersect the extension line of line segment DC at point E;

(4) Connect the line segment AD and extend it in the opposite direction.

Straight line ray segment PPT, Part 6 content: Class summary

Mathematical knowledge:

• Two points define a straight line.

• The connection and difference between straight lines, rays and line segments.

• Representation methods of straight lines, rays, and line segments.

• Mutual transformation of different geometric languages ​​(literal language, symbolic language, graphic language).

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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"Straight Lines, Rays, Line Segments" Preliminary PPT on Geometric Figures (Lesson 2) Part One: Learning Objectives 1. Be able to use a ruler to draw a line segment equal to a known line segment, and be able to compare the length of two line segments. (Key Points) 2. Understand The meaning of bisecting points of line segments. 3. Be able to use lines..

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Update Time: 2024-11-22

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

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