This lesson is the content of the third section of Chapter 4 of Grade 7 (Volume 1) of People's Education Press. Before this, students have learned the basic concept of angle and the measurement of angle. This is the preparation of knowledge and thinking for the teaching of this course.
At the same time, it paves the way for students to understand the concepts of lower angle and complementary angle, thus laying the foundation for students to learn plane geometry. Therefore, this section has played a role in reviewing old knowledge and undertaking new knowledge.
The teaching objectives of this lesson are as follows:
1, can draw with a ruler, one angle equals a known angle, and is familiar with and understands descriptive language.
2. By analogy, learn to compare the sizes of two angles and analyze the relationship between the sum and difference of the angles in the diagram.
3. Through hands-on operation, learn to spell out angles of different degrees with the help of triangles, know the bisector of the angle and the bisector of the angle, and draw the bisector of the angle.
Baidu Encyclopedia-Corner