Teaching objectives:

1, to understand various symmetry phenomena.

2. Identify the axisymmetric phenomenon.

3. Understand the properties of axisymmetric graphics and use them to solve problems.

other

Student analysis: Students have learned simple plane graphics, have a certain understanding of plane graphics, and have a preliminary understanding of the methods and means of learning plane graphics. Senior students have the characteristics of being competitive, and the class has initially formed a good style of study such as cooperation and exchange, courage to explore and practice, and the atmosphere of mutual discussion among students is relatively strong.

Design concept: according to the specific objectives of the basic education curriculum reform, it is a feature of the mathematics curriculum standard to encourage students to discover knowledge in concrete and intuitive operations. Change the tendency of paying too much attention to knowledge transmission, emphasize the formation of active learning attitude, pay attention to students' learning interest and experience, implement open teaching, let students actively participate in learning activities, and guide students to feel the generation, development and change of knowledge in classroom activities.