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Authoritative PPT Summary
"Line Segments, Rays and Straight Lines" PPT courseware
Observe the pictures below (1-7) and answer:
1. Is the rope in picture (1) straight or curved?
2. Is the rope in picture (2) straight or curved?
3. During tug-of-war, what image does the straightened rope give us?
A straightened rope gives us the image of a line segment.
A line segment has ___ endpoints.
A ray is formed by extending a line segment infinitely in one direction.
A ray has ___ endpoints.
Extend the line segment infinitely in both directions to get a straight line.
Line _____ endpoints.
display method:
Points are represented by a capital letter.
Line segments, rays, and straight lines can all be represented by two capital letters.
Referred to as:
Line segment AB or line segment BA
Ray AB
Straight line AB or straight line BA
Read textbook page P15
"Luring" music with straight lines
In Figure 1-24, please connect the points with the same number on adjacent sides with line segments to see what kind of figure you will get.
Under certain conditions, the merits are not so clear-cut and the merits can transform into each other. In mathematics, curves are often studied with the help of straight lines. It is difficult to study "qu" without "straight"
Experimentation and inquiry
If two straight lines pass through the same point, they are said to intersect. At this time, the two straight lines have a unique common point. This common point is called their intersection point. In Figure 1-26, straight lines AB and CD intersect, and point O is their intersection.
Challenge yourself
Two straight lines on the plane can have at most one intersection point;
3 straight lines, with up to 3 intersection points;
4 straight lines, how many intersection points are there at most? Draw a picture.
If there are 5 straight lines on the plane, how many intersection points are there at most?
What patterns did you discover? Communicate with classmates.
n straight lines on the plane have at most _______ intersection points;
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"Line Segments, Rays and Straight Lines" PPT courseware 3:
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"Line Segments, Rays and Straight Lines" PPT courseware 2:
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