论文部分内容阅读
一、填空题1.如果两圆的公切线有且只有1条,那么这两圆的位置关系是_.(2002年北京市西城区中考题)2.己知半径分别为4和2、迈的两圆相交,公共弦长为4,则两圆的圆心距为_. (2002年湖北省荆州市中考题)3.要用圆形铁片截出边长为4 om的正方形铁片,则选用的圆形铁片的直径最小要_cm.
1. Fill in the blanks 1. If there are only one and two common tangents for the two circles, then the positional relationship between these two circles is _. (2002 Xicheng District, Beijing) 2. Known radii are 4 and 2, respectively. The two circles intersect, and the common chord length is 4, then the two circles have a circle center distance of _. (2002 Jingzhou City, Hubei Province, examination questions) 3. Use a round iron piece to cut out a square iron piece with a length of 4 om, The smallest circular iron piece to be used is _cm.