已知圆C:
,P点的坐标为(2,-1),过点P作圆C的切线,切点为A,B.
(1)求直线PA ,PB的方程;
(2)求过P点的圆的切线长即PA ,PB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b169005a471f6a39d3fa22dd7353fc66.png)
(1)求直线PA ,PB的方程;
(2)求过P点的圆的切线长即PA ,PB的长.
更新时间:2018-12-07 14:44:14
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【推荐1】已知圆
的方程为
,点
在直线
:
上,过点
作圆
的切线
,
,切点为
,
.
(1)若点
的坐标为
,求切线
,
方程;
(2)证明:经过
,
,
三点的圆必过定点,并求出所有定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ecf7a6913d90c2df051d608011cc57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac7c28099bfbb7dc2a45ad166eace05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)证明:经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解题方法
【推荐2】已知圆
的方程为
,点
的坐标为
.
(1)求过点
且与圆
相切的直线
的方程;
(2)直线
过点
,且与圆
交于
两点,若
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce7aa72cea164858361429853492d30.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8156a557d9b963a77dfd88178789ac7.png)
(1)求过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
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【推荐1】已知圆
上一点
关于直线
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上,直线
截得圆
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(1)求圆
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)设
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【推荐2】已知圆
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的轨迹为图形
,由图形
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向该图形引一条切线,切点为
,
为坐标原点,且有
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的最小值.
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