2018_2019学年高中数学考点51直线与圆的位置关系庖丁解题新人教A版必修2.doc

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1考点 51 直线与圆的位置关系要点阐述直线 Ax By C0 与圆( x a) 2( y b) 2 r2的位置关系及判断位置关系 相交 相切 相离公共点个数 2 个 1 个 0 个几何法:设圆心到直线的距离 d|Aa Bb C|A2 B2 d r判定方法代数法:由Error!消元得到一元二次方程的判别式 0 = 0 0)取什么值时,直线 x y2 a10 与圆( x a)2( y1) 2 a(1)相离;(2)相切;(3)相交数学文化使至塞上王维单车欲问边,属国过居延征蓬出汉塞,归雁入胡天大漠孤烟直,长河落日圆萧关逢候骑,都护在燕然第三句以出色的描写,道出了边塞之景的奇特壮丽和作者的孤寂之感“荒无人烟的戈壁滩上只有烽火台的浓烟直冲天空”,如果我们从数学的角度看到的将是这样一副几何图形:一条直线垂直于一个平面那么“圆圆的落日慢慢地沉入黄河之中”又是怎样的几何图形呢?

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