《三角形全等的剖断(三)》传授教化设计(国外英文资料).docVIP

《三角形全等的剖断(三)》传授教化设计(国外英文资料).doc

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《三角形全等的剖断(三)》传授教化设计(国外英文资料)

《三角形全等的判定(三)》教学设计(国外英文资料) Are the three sides of the two triangles congruent? (2) we have three sides of the triangle (projection) as shown in figure 1, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you know, you Note that the two points of attention are known to be the three sides of the triangle ABC, and the drawing tool is the compass and the ruler. It is pointed out that the key to drawing a triangle is to determine the three vertices of a triangle. How to draw? How do you draw the third vertex? Figure 1 (1) (2) On the basis of the analysis, the teacher demonstration drawing on the blackboard, draw the figure 1, figure 2, students imitate by watching them draw below (note the infiltration and explain the track ideas of two arc). A students oral painting, which is complemented by the students and teachers; Finally, the accurate and accurate drawing method is used to show that the students have a clear and accurate understanding of the representation of the painting method in order to imitate it in the future. (3) the experiment, the conjecture, and the revelation of side by side axioms. Ask the students to draw their own good triangle A B C C, cut off with the scissors of triangle ABC, observe the experiment phenomenon, then ask the following question to ask the student to answer. What facts can be discovered by experiment? (the two triangles coincide, without exception. The delta ABC ≌ delta A B C ) (2) summarize the experimental conclusion in what language? Students answered the teacher pointed out: after the above conclusion is that people in the long-term practice has proved to be correct propositions, therefore, we use it as an axiom to determine two triangles are congruent; Its called side by side axioms. Blackboard:

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