? What is onion mathematics?
Onion Mathematics is an online learning platform. Through 5-8 minutes of animation, explain related mathematical concepts, unlimited viewing times, and cooperate with handouts, exercises and tests to achieve personalized learning goals.
The traditional mathematics learning method of reciting mathematical formulas and doing problems repeatedly will make children feel boring and abstract mathematical concepts difficult to understand. Onion mathematics can arouse children's interest in mathematics learning through the story animation that can attract children the most. A short film can understand a mathematical concept, which is very convenient for you to preview and review before and after class!
? Topics of this chapter:
1, understand the definition and expression of vertical.
2. Give examples of vertical objects in life.
* Plus code: add the concept that two lines are perpendicular to each other and the description of vertical foot.
? The main contents of this chapter:
Figure 1
Figure ii
Figure 3
Why learn that two straight lines are perpendicular to each other? The film begins with how to make the house stable, so that children can understand the importance of verticality through interesting image vision. What is the significance of verticality?
Originally, the right included angle between the wall and the ground ∠ 1 is as big as the left included angle ∠2. At this time ∠ 1=∠2=90 degrees (Figure1); The architect checks whether the wall is vertical to the ground with a plumb hammer to determine whether the building is stable (Figure 2); When the straight line A and the straight line B are perpendicular to each other, it is indicated by the symbol a⊥b, and their intersection point is called vertical foot (Figure 3).
? Key points that students often ignore:
Figure 4
Figure 5
Figure 6
1. Determine the vertical direction:
When practicing this unit, we should focus on the method of judging the vertical line, which is not affected by the oblique direction of two straight lines. There is only one criterion for judging, that is, the included angle between the two straight lines is 90 degrees (Figure 4), so the two supports of the famous Dutch windmill are perpendicular to each other no matter where they turn (Figure 5).
2. Linear positional relationship: It should be noted that the positions of two straight lines on the same plane (Figure 6) are not only parallel and vertical!
? You can study at home:
1. Parents can ask their children, what is the meaning of two straight lines being vertical? Why is the included angle equal to 90 degrees? Through these dialogues, children can understand the meaning of verticality.
2. What examples in life will use the vertical concept? Through these dialogues, children can know the importance of learning vertical.
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