Green pepper was introduced to us by Onion College. I should be the first teacher to use green pepper. Because of the welfare of green peppers, we immediately contacted the onion teacher and opened a member, which has been used until now. Of course, due to the limitation of multimedia functions in the classroom, onion college can not be fully developed in my classroom, but I still want to introduce it to you.

After opening the membership, you will enter the page of the corresponding grade and subject, where teachers can assign homework and check homework, and manage class members and students.

? When the textbook is opened, the chapter names will be displayed. For example, the following is the fourth chapter I want to introduce-intersection line and parallel line. In the lower right corner, you can switch chapters. The drop-down is the specific chapter of the chapter, which is the angle formed by the intersection of 4.1.2, which I used for teaching design today.

This course is chosen because we will face the graphic problems that students can't understand immediately after the mid-term exam. Abstract thinking and logical thinking are very important in the combination of numbers and shapes, which can lay the foundation for studying geometry in the future. Therefore, if the explanation of "three-line octagon" is boring, it will reduce students' interest in mathematics.

So when previewing before class, I will give students the study plan of Onion College and ask: Please watch the following video and think about it:

1. What is a three-line octagon? "

2. Is the three-line octagon really only eight corners?

Then guide the students to complete the test.

The focus and difficulty of this lesson is "three lines and eight sides". Therefore, when watching the teaching clips of Onion College, I will use the clip teaching to let students understand the concepts-internal angle, congruent angle, diagonal angle and ipsilateral internal angle. These have all been seen in the previous preview video. Students can learn the positions and naming reasons of these corners in specific graphics by pausing the video and using onion tests.

Of course, it is popular now that "eyes know hands but not hands", so exams are very important. Paying attention to students' experience and feedback in class can let students know whether they have mastered the concept of this class. Students who master quickly can start to do the questions before watching the video, while those who understand slowly can be regarded as consolidation exercises, and finally there is an advanced question.

After this class, the students learned about the concept of "three-line octagon" through the teaching video of Onion College, and got feedback through exercises. In their minds, they will also form a certain impression on the relative position between the corners. With the guidance of teachers, students' participation should be high.