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【知识梳理】1.直线和圆相交、相切、相离的概念:直线与圆有三种位置关系:1直线和圆没有公共点,叫做直线和圆相离;2直线和圆有唯一公共点,叫做直线和圆相切。这时直线叫做圆的切线,唯一的公共点叫做切点。3直线和圆有两个公共点,叫做直线和圆相交,这时直线叫做圆的割线。说明:直线和圆相切是指直线和圆有一个并且只有一个公共点。与
【Knowledge combing】 1. The concept of intersecting, tangent and phase separation between lines and circles: there are three kinds of positional relationships between straight lines and circles: 1 There is no common point between straight lines and circles, which is called straight line and circle; 2, there is only one common point , Called the straight line and the circle tangent. The straight line is then called the tangent of the circle, and the only common point is the point of tangency. 3 lines and circles have two common points, called the intersection of a straight line and a circle, then a straight line called the circle secant. Description: A tangent to a circle means that the line has one and only one common point to the circle. versus