解题方法
1 . 已知直线
,点
,圆心为
的动圆经过点
,且与直线
相切,则 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958e252a7e8d02eba708cc7380a86d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b5e076078240e0c5ad9763a9824d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
A.点![]() |
B.圆![]() ![]() |
C.当圆![]() ![]() ![]() ![]() ![]() |
D.存在点![]() ![]() ![]() |
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