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“切线的判定”这节内容是人教版九年级第二十四章《圆》全章的重点之一,是历年中考的热点。在学习了直线与圆的位置关系的基础上,进一步探究直线和圆相切的条件,并为探究切线长定理和切割线定理而作准备的,所以切线在圆的学习中起着承上启下的作用,在整个初中几何学习中起着桥梁和纽带的作用。它是几何学习中必不可少的知识工具。但对很多学生而言也是一个难点。
“Tangential judgment ” This section is one of the key points of Chapter 24 of the PEP of the PEP for the Yearbook of PEP, which is a hot spot in the examinations of the previous years. Based on the study of the relationship between the straight line and the circle, the paper further explores the conditions of tangent of the straight line and the circle and prepares for the study of tangent length theorem and cutting line theorem. Therefore, tangent plays a role in the circle learning , Plays a role as a bridge and link in geometric learning throughout the entire junior high school. It is an essential knowledge tool in geometry learning. But for many students is also a difficult point.