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三角形全等的证明(北师大) - 山东省教师教育网(国外英文资料)
三角形全等的证明(北师大) - 山东省教师教育网(国外英文资料)
People do a Book slaves, then living with dead Put the book as a tool, the books of knowledge will live. The vitality of the. - Hua Luogeng
Proof of congruent triangles (Beijing Normal University)
[teaching content analysis]
This class is the triangle congruent conditions of third hours, is inquires into the class, the students through their own hands-on experiments, through exploration of triangle congruent condition of ASA, and by inference triangle congruent condition AAS experience using mathematical thought and methods to solve the problem of the transformation.
[Objective] teaching
1. experience exploration of triangle congruent condition of ASA and AAS, and they can be used to determine two congruent triangles.
2. experience process by mathematical ideas and methods to solve the problem of the transformation.
3. in the process of exploration and application conditions of congruent triangles, able to think clear and simple reasoning.
[teaching key]
Key: to master the condition congruent triangles ASA and AAS and its application.
Difficulties: the exploration of triangle congruent condition of ASA and AAS and its application.
[] teaching preparation
The scale, protractor and compass.
The teaching process []
Teaching design
Design description
First, the creation of scenarios
(1) to discuss: the teacher will not be a three
Angle shaped glass broken into three pieces (Figure 1),
Now only one piece of tape, glass shop
The master will be able to match a piece with the original.
With a triangular glass, you should know where to take a piece of glass? (1)
(2) think: brought a piece of it is equal to take several elements of the triangle?
The only such a triangle?
(3) do: please use a protractor and a ruler to draw ABC, BC=3cm, B=40 / C=60 / DEG, degrees, will you draw a triangle with other students painted triangle, what have you found? (students in practice. On the basis of conjecture)
On the basis of existing knowledge, students can
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