一、抓基础知识圆这一章的基础知识,包括有关的概念、定理、计算公式,基本作图题和轨迹。复习前,要求学生通读教材,进一步理解和熟悉主要定理的叙述和证明的方法。在此基础上,引导学生归纳整理,主要从动的观点揭示几何图形的内在联系,使知识系统化。例如,把相交弦定理、相交割线定理和切割线定理统一成一个定理。相交弦定理和相交割线 First, grasp the basics The basic knowledge of this chapter, including the concepts, theorems, formulas, basic mapping problems and trajectories. Before the review, students are required to read through the teaching materials to further understand and familiarize themselves with the methods of describing and proving the main theorems. On this basis, guiding students to induction and collation, the main point of view of the initiative to reveal the inherent relationship between geometric shapes, so that systematic knowledge. For example, the theorems of intersectional stringing, intersecting secant and theorem of cutting line are unified into one theorem. The intersection of chord theorem and intersection line