This lesson is the first lesson in the third quarter of the fourth chapter of seventh grade mathematics in Beijing Normal University. Students learned the concept of triangle and the relationship between three sides. I also learned the knowledge of graphic congruence and congruent triangles. Have a certain knowledge base on this section.

Second, the teaching objectives:

? Explore the process of triangle congruence condition SSS, and draw a mathematical conclusion through operation induction. Solve problems with the conditions of triangular congruent SSS, and use conditional action reasoning.

Third, the difficulties in teaching:

Teaching emphasis: explore the conditional SSS of triangle congruence, and judge the completeness of two triangles by using the conditional SSS of triangle congruence.

Teaching difficulty: the analysis and exploration process of triangular congruence conditions.

Fourth, teaching preparation:

Two movable teaching models of congruent triangles. Onion college teaching resources.

Verb (abbreviation of verb) teaching process;

① Play the SSS complete teaching video of the judgment theorem of triangle congruence in the third quarter of the seventh grade mathematics of Beijing Normal University Edition of Onion College.

The purpose is to replace traditional teaching with interesting and vivid teaching videos. To improve students' learning interest and efficiency, students can easily integrate into the exploration process and understand theorems. In the teaching process, all students attach great importance to their learning, and the learning efficiency is greatly improved. Achieve teaching goals faster.

② According to the video content, use the movable congruent triangles mold to guide students to explore the equilateral situation of the triangle.

③ It is concluded that two triangles with equal sides are congruent, abbreviated as side or SSS.

④ Class summary: Give full play to the teaching resources of Onion College-this section explains the key points and difficulties. Use short videos to highlight the important and difficult points in this section. Further consolidate the knowledge in this section. ?

Sixth, homework.

Exercise 4.6? The first problem of mathematical understanding. Video Review of Onion College Teaching Resources

Seven, teaching reflection.

Using the resources of Onion College can effectively solve the confusion of traditional teaching! Usually, most of our teaching is taught by teachers and students are listening. It is inefficient to rely on teachers to talk about mathematics, and many students can't learn all the knowledge!

The micro-video of Onion College is used in classroom teaching, which makes it easier for students to understand knowledge points. Micro-video is short and pithy, which is very suitable for classroom finishing touch!