已知圆
:
和点
.
(Ⅰ)若过点
有且只有一条直线与圆
相切,求实数
的值,并求出切线方程;
(Ⅱ)当
时,试判断过点
,且倾斜角为
的直线
与圆
的位置关系.若相交,求出相交弦
长;若不相交,求出圆
上的点到直线
的最远距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000569d56fe1e81b5a29aaefe425879e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b03aa30a9d20e5267e0dbcda48d5737.png)
(Ⅰ)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05252c9203c1c17c198747182ef2e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
更新时间:2018-02-06 22:00:12
|
【知识点】 坐标法的应用——直线与圆的位置关系
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知圆
,圆心
在直线
上,且被直线
截得弦长为
.
(1)求圆
的方程;
(2)若
,已知点
,
,
,当
在圆
上运动时,记
的最大值和最小值分别为
和
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c1b612ca9a5e2abdac02e7e36022ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45900deae0489e87fe448948e8091c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f421939ee855f25927e7570d82c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7123cafcde8f0f81d269926ad6a45e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7c65a12b8150d8f47ed9a67a5ea31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90412cabfb9506de6d1fae9bd58fe3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed9a3976b506be220a26873931651b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed83485b04357536c07c06cdd74f149.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】在直角坐标系xOy中,曲线C的参数方程为
(t为参数).以坐标原点O为极点.x轴的正半轴为极轴建立极坐标系,直线l的极坐标方程为
.
(1)求曲线C的普通方程与直线l的直角坐标方程;
(2)若直线l与曲线C存在两个公共点,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0bb0f16a4e56bdaca3af8fc47644a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c230b18871b49d1bd79063e8654e1b0f.png)
(1)求曲线C的普通方程与直线l的直角坐标方程;
(2)若直线l与曲线C存在两个公共点,求实数m的取值范围.
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