如图是一个挂在墙壁上时钟的示意图.
是其秒针的转动中心,
是秒针的另一端,
,
是过点
的铅直直线.现有一只蚂蚁
在秒针
上爬行,蚂蚁
到点
的距离与
到
的距离始终相等.则
分钟的时间内,蚂蚁
被秒针
携带的过程中移动的路程(非蚂蚁在秒针上爬行的路程)是 ______ ![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/fe456da7f8df4e8c84e8f8e2ead79cd1.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/349578f6f2004954af5fb083f6df215a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/27a2cbc597814829b2368cdd0e65c78e.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/332c351a97654b5daa09972d85becb72.png?resizew=75)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/c6fab83058d24934885c54373fce3066.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/349578f6f2004954af5fb083f6df215a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/b76a018b993a4d3eb896ce7f69bde5bd.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/16a2cca525f84f80b0fbc8395d4251cb.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/b76a018b993a4d3eb896ce7f69bde5bd.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/349578f6f2004954af5fb083f6df215a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/27a2cbc597814829b2368cdd0e65c78e.png?resizew=21)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/c6fab83058d24934885c54373fce3066.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/14918955d88e43d3a58733fd010dd5bc.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/b76a018b993a4d3eb896ce7f69bde5bd.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/16a2cca525f84f80b0fbc8395d4251cb.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/fe456da7f8df4e8c84e8f8e2ead79cd1.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2011/5/20/1570213716729856/1570213721784320/STEM/644b7b49-3946-4b26-b7da-9bbb21d0cf20.png)
2011高一·安徽蚌埠·学业考试 查看更多[1]
(已下线)2010-2011年安徽省蚌埠市七中高一自主招生考试数学
更新时间:2016-11-30 21:10:54
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【知识点】 圆的方程
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解题方法
【推荐1】大约在2000多年前,我国的墨子给出了圆的概念“一中同长也”,意思是说,圆有一个圆心,圆心到圆周的长都相等.这个定义比希腊数学家欧几里得给圆下定义要早100多年.已知直角坐标平面内有一点
和一动点
满足
,若过点
的直线
将动点
的轨迹分成两段弧,当劣弧所对的圆心角最小时,直线
的斜率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134fc3507b06c25a6cdf06b7ae11f055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeaac7097c2d30afa27baa124af469f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e3e694d6f8af2589e3c12dead783b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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【推荐2】已知圆
的圆心在直线
上,过点
且与直线
相切,则圆
的方程是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42498f6e0fc9a61c9857b70a87f02c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da7544af9e0d48ac4a99c8d5290f789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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