[选修4-4:坐标系与参数方程]
已知极坐标系中的曲线
与曲线
交于
,
两点,求线段
的长.
已知极坐标系中的曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa841c771367399f51d2bfcb9d37e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feed563d332e757b755e14ffc7f5cf29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2017-02-08 11:39:08
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【知识点】 极坐标与直角坐标的互化解读
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解答题-问答题
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【推荐1】极坐标系与直角坐标系
有相同的长度单位,以原点
为极点,以
轴正半轴为极轴.已知直线
的参数方程为
(
为参数),曲线
的极坐标方程为
.
(1)求
的直角坐标方程;
(2)设直线
与曲线
交于
两点,求弦长
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef2d0e8e134c89efafa960b981ea059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d44ff73d1c293d3461442dd1b5359d9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaff41080fdea43eea7efedf9ebc1498.png)
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解答题-问答题
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较易
(0.85)
【推荐2】选修4—4:坐标系与参数方程
在平面直角坐标系
中,直线
过点
,倾斜角为
﹒以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系,圆
﹒若直线
与圆
相交于
两点,求
的值.
在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca1847408cd56251369571a8bb645a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffba1c17bbe9ccc8b4c50ec06008c705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbea66ed0678bdf40ad1ce8eeb7cc04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a986c6fcc88592070e0323aab45583.png)
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