选修4-4:坐标系与参数方程
已知直线l过点P(-3,2),倾斜角为
,且
.曲线C的参数方程为
(
为参数).直线l与曲线C交于A、B两点,线段AB的中点为M.
(Ⅰ)求直线l的参数方程和曲线C的普通方程;
(Ⅱ)求线段PM的长.
已知直线l过点P(-3,2),倾斜角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a9d1b8269a6ff06ee8a1f45cfe72a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4853ee07413c2edbad16f960fbee38a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(Ⅰ)求直线l的参数方程和曲线C的普通方程;
(Ⅱ)求线段PM的长.
更新时间:2017-12-22 14:15:06
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【推荐1】在直角坐标系
中,直线
的参数方程为
(
为参数),以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系,曲线
的极坐标方程为
.
(1)求直线
的普通方程和曲线
的直角坐标方程;
(2)若直线
与曲线
交于
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0277383a2b4ee98365c09d928cf987b2.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】在直角坐标系中,直线l过点
,且倾斜角为
,
以直角坐标系的原点O为极点,x轴的正半轴为极轴建立极坐标系,曲线C的极坐标方程为
.
求直线l的参数方程和曲线C的直角坐标方程,并判断曲线C是什么曲线;
设直线l与曲线C相交与M,N两点,当
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的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b1b1024df5806a30b7e1bcf82f0f3f.png)
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【推荐3】在以
为极点,
轴的正半轴为极轴的极坐标系中,曲线
:
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(1)求曲线
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两点,求证:
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(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐1】在极坐标系中,圆C的方程为
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您最近一年使用:0次
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【推荐2】在直角坐标系
中,曲线
:
(
为参数),以原点
为极点,
轴的正半轴为极轴建立极坐标系,曲线
:
,曲线
与曲线
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,
两点.
(1)求曲线
的直角坐标方程与直线
的一般方;
(2)点
,求
.
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(1)求曲线
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(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7461e369c4b4d69841e4062d9f7d6f3b.png)
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【推荐3】平面直角坐标系中,直线
的参数方程为
(t为参数),以坐标原点
为极点,x轴正半轴为极轴建立极坐标系,曲线C的极坐标方程为
.
(1)求直线
的普通方程和曲线
的直角坐标方程;
(2)设点
,直线
交曲线
于
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(2)设点
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