论文部分内容阅读
1学情分析“圆的对称性”这节课是在学生了解了有关圆的基本概念——圆的定义与圆中弦、弧以及圆心角的定义的基础上进行的,其中圆心角是根据本班级学生的特点重新安排了教材内容,将本节课的这个概念一并在前一节已完成。而其中的等弧概念是学生易混概念,为了给下一节课作一个坚实的基础,在等弧的教学中作了重点强调与分析。本节课作的内容正是前面所学知识的应用,也是本章中证明同圆或等圆中弧等、角等以及线段相等的重要依据,是下一节课垂径
1 academic analysis “circle symmetry ” This lesson is based on the students to understand the basic concept of the circle - the definition of the circle and the definition of the middle chord, arc and central angle, the center angle Is based on the characteristics of this class of students rescheduling the textbook content, the concept of this lesson together in the previous section has been completed. Among them, the concept of equi-arc is a concept that students are easy to mix. In order to lay a solid foundation for the next lesson, emphasis and analysis are made in the teaching of equi-arc. The content of this lesson is exactly the application of the previous knowledge, which is also an important basis for proving equal arcs, angles, etc., of the same circle or equi-circle in this chapter, as well as the equivalent of the next lesson