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Authoritative PPT Summary
"The Distance Between Two Points" Lines and Angle PPT Courseware
teaching objectives
1. Combining specific examples and hands-on measurement processes, realize that the shortest line segment is the shortest among all connections between two points.
2. Know that the length of a line segment between two points is called distance, and you can measure the distance between two points.
3. Be able to use the knowledge of the shortest line segment between two points to describe things in life and feel the connection between mathematics and life.
Look at the pictures and speak.
Observe the picture and tell me what is in the picture?
What did you learn about mathematics-related issues from the picture?
Which of the three lines connecting points A and B is the shortest?
AB①=________
AB②＝________
AB③=________
Of all the lines connecting two points, the line segment is the shortest.
The length of the line segment between two points is called the distance between the two points.
practice
1. (1) The railway length from Beijing to Guangzhou is 2,288 kilometers.
(2) The expressway from Beijing to Guangzhou is 2,148 kilometers long.
(3) The air route from Beijing to Guangzhou is 1,966 kilometers long.
What did you discover from the data above?
2. Without measuring, do you know which way is closest? Why?
3. Draw three lines between points A and B, and measure the lengths of these three lines respectively.
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