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圆与圆的位置关系有五种:内含、内切、相交、外切、外离.其判定方法通常有两种:一种是根据两圆的位置关系的定义即利用两圆公共点的个数来判定;另一种是由圆心距与两圆半径的长度来确定即通过两圆的半径与两圆圆心距之间的数量关系来判定其位置关系.笔者在长期的教学实践中,充分借助数轴的直观性,探索实践了第三种方法
There are five types of relationship between the circle and the circle: internal, internal, intersecting, circumcision, external. There are usually two ways to determine the circle: one is based on the definition of the location of the two circles that use the common point of two circles The other is determined by the length of the center of the circle and the radius of two circles to determine the relationship between the radius of the two circles and the distance between the two circles to determine the location of the relationship between the author in the long-term teaching practice, Take full advantage of the intuitiveness of several axes to explore and practice the third method