解答题 适中0.65 引用2 组卷701
选修4-4:坐标系与参数方程
在直角坐标系
中,直线
的参数方程为
(
为参数),在极坐标系(与直角坐标系
取相同的长度单位,且以原点
为极点,以
轴非负半轴为极轴)中,圆
的方程为
.
(1)求圆
的直角坐标方程;
(2)若点
,设圆
与直线
交于点
,求
的最小值.
在直角坐标系
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/9e5c862aace14441a5574c4b80444817.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/5252dcc5ba4c49b9b1f5ada8715ad176.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/a5e8cd134cb94b40b64218a8fa6d7518.png?resizew=98)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/2ee60fd40345480895061a3f8d2fb106.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/9e5c862aace14441a5574c4b80444817.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/0b7f0662ba9b46f0b5af083b6af22efb.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/054352f350214cdb80f0cbc885f76926.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/3fc9bcdbdb434b5ea1c8fe48b218f122.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/1dc0ec55a9c34f4ba2469e2d03b962c4.png?resizew=72)
(1)求圆
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/3fc9bcdbdb434b5ea1c8fe48b218f122.png?resizew=16)
(2)若点
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/0060fb78ec354ff2bdaea10b03d06d3b.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/3fc9bcdbdb434b5ea1c8fe48b218f122.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/5252dcc5ba4c49b9b1f5ada8715ad176.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/df730db9dc6949c0a9a282a00599c5c1.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896381664387072/1897088129171456/STEM/27e4ab3b6ce8485993aef1e5102bb864.png?resizew=83)
18-19高三上·河南南阳·期末
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