【教学目标】本节课是苏科版九年级上册《对称图形——圆》这一章的第一课时.主要目标是让学生通过实例来归纳出圆的定义和集合的定义,并通过一些日常生活中的例子,使学生经历圆的概念的形成过程,理解点和圆的位置关系,能根据条件画出符合条件的点或图形,初步形成集合的概念.【教学重、难点】重点:确定点与圆的三种位置关系以及 【Teaching Objectives】 This lesson is the first lesson of the Symmetry Graphics - Circle in the upper grades of Su Ke version of Grade 9. The main goal is to let the students summarize the definition of a circle and the definition of a collection through some examples Examples in daily life enable students to experience the formation of a round concept, understand the positional relationship between points and circles, draw qualified points or figures according to the conditions, and initially form the concept of a collection. 【Teaching heavy and difficult】 Focus: Determine the location of the three points and the circle as well