如图,有一条长度为1的线段
,其端点
、
在边长为3的正方形
的四边上滑动.当
绕着正方形的四边滑动一周时,
的中点
所形成的轨迹的长是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/e1e9337a-29cd-4cbb-b511-7f83db89338f.png?resizew=156)
2007高三·上海·竞赛 查看更多[1]
更新时间:2018-12-23 22:52:42
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【知识点】 圆锥曲线
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适中
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【推荐1】若曲线
上的点
到直线
的距离为2016,则点
到第一、三象限角平分线的距离为______ .
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【推荐2】已知椭圆域D1:
与圆域D2:
.则区域D1与D2公共部分的面积为______ (精确到0.01),注:可用结果:在椭圆
中,B为上顶点,P(x0,y0)为椭圆第一象限部分上一点,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4d53088ed8b97abfcbc38e1f19de1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631ae6211b7e36ab0aa66f86eb3acd53.png)
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