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Authoritative PPT Summary
"Comparison and Practice of Line Segments" PPT courseware
learning target
1. Understand an important property: among all the lines connecting two points, the line segment is the shortest.
2. Able to use a ruler and compass to compare the length of two line segments, and express it with the symbols ">", "<" and "=".
3. Understand two concepts: the distance between two points and the midpoint of a line segment. Able to use a scale to measure the distance between two points, draw the midpoint of a line segment, and express it using symbolic language. (Important content)
Of all the lines connecting two points, the line segment is the shortest.
The length of the line connecting two points is called the distance between the two points. Use a scale to measure the length of a line segment.
Experimentation and inquiry
In Figure 1-29, the length of line segment AB measured with a scale is 3 cm, so the distance between points A and B is 3 cm.
The length of the line connecting two points is called the distance between the two points. Use a scale to measure the length of a line segment.
(1) As shown in the picture, can you compare the length of the two pencils? Can you compare the length of two line segments? How to compare? Communicate with classmates.
(2) As shown in Figure 1-31, given line segment AB, how to draw a line segment equal to line segment AB? Draw it.
As shown in Figure 1-33, if you want to saw a strip of wood into two equal sections, where should you cut it?
As shown in Figure 1-34, if point M divides line segment AB into two equal line segments AM and BM, then point M is called the midpoint of line segment AB.
At this time AM=BM=1/2AB AB = 2AM=2BM
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"Comparison and Practice of Line Segments" PPT Courseware 2:
"Comparison and Practice of Line Segments" PPT Courseware 2 Collaborative Exploration Content: 1. Questions encountered during learning 2. Questions in the questioning and inquiry part of the tutorial case Requirements: (1) Everyone participates, discusses enthusiastically, and expresses their thoughts loudly. (2) The team leader controls the pace of discussion,...