解题方法
1 . 已知直线
经过点
,且平分圆
的面积,则
的方程为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bf6780e1f42177cca9aa0e4ff860f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
2 . 已知圆
过点
.
(1)点
,直线
经过点A且平行于直线
,求直线
的方程;
(2)若圆心
的纵坐标为2,求圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ca3715a4fa36cb21b4bbba6d14c5e2.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3f9d5a2752ca0a9cf9f5b8ad62d9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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12-13高二上·海南·期末
3 . 如图,倾斜角为
的直线经过抛物线
的焦点,且与抛物线交于A、B两点,Q为A、B中点,
![](https://img.xkw.com/dksih/QBM/2012/2/21/1570759455793152/1570759461314560/STEM/015578310d90466c88f42fc1e127f984.png?resizew=234)
(1)求抛物线的焦点坐标及准线l方程;
(2)若
,作线段AB的垂直平分线
交
轴于点P,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://img.xkw.com/dksih/QBM/2012/2/21/1570759455793152/1570759461314560/STEM/015578310d90466c88f42fc1e127f984.png?resizew=234)
(1)求抛物线的焦点坐标及准线l方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e222c14e46e2fcbb8285eeb18e5ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6598eb226fbe3e4af8fdcbb9ab902de7.png)
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