已知圆C过点
,
,
,直线l过点
.
(1)求圆C的标准方程;
(2)若直线l与圆C相切,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8156a557d9b963a77dfd88178789ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e88ebfb5c0d6cce558b515be06404d.png)
(1)求圆C的标准方程;
(2)若直线l与圆C相切,求直线l的方程.
更新时间:2021-11-06 10:19:04
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【推荐1】(1)已知在平面直角坐标系中,
,求
的外接圆的方程;
(2)已知直线l在两坐标轴上的截距相等,且点
到直线l的距离为
,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8184d3356a390b772df4f62b7ae171a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(2)已知直线l在两坐标轴上的截距相等,且点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9ece4ff94b2b1c4cc7ee25000f996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐2】已知圆
经过
,
两点,且圆心在直线
:
上.
(1)求圆
的方程;
(2)从
轴上一个动点
向圆
作切线,求切线长的最小值及对应切线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7908e8e2ca67ad0f739860222423950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b32a92039ba74fca3ff47ec3b184c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056e249d0c33ef92b956f84937fa9324.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐1】如图,在平面直角坐标系
中,点
,直线
,设圆C的半径为1,圆心在l上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/5426adc8-1854-4d34-b385-3a24824b222a.png?resizew=147)
(1)若圆心C也在直线
上,过点A作圆C的切线,求切线的方程;
(2)若圆C上存在点M,使
,求圆心C的横坐标a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc878a5fd7b508cf817cbb65d3940547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db0a1cbf7b0ed76c443b953af8734d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/5426adc8-1854-4d34-b385-3a24824b222a.png?resizew=147)
(1)若圆心C也在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c1212804e6d784756d48083d166e8.png)
(2)若圆C上存在点M,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a464b0c729f294287d3d89119a585293.png)
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【推荐2】已知圆C的圆心在直线l:y=2x上,且经过点A(﹣3,﹣1),B(4,6).
(Ⅰ)求圆C的方程;
(Ⅱ)点P是直线l上横坐标为﹣4的点,过点P作圆C的切线,求切线方程.
(Ⅰ)求圆C的方程;
(Ⅱ)点P是直线l上横坐标为﹣4的点,过点P作圆C的切线,求切线方程.
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