如图,在直角坐标系中,⊙A的圆心A的坐标为(1,0),半径为1,点P为直线y=
x+3上的动点,过点P作⊙A的切线,切点为Q,则切线长PQ的最小值是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/2018/4/30/1935457932427264/1936878151491584/STEM/2d9dd071-397d-47be-83e1-78bcd80e8b9a.png)
2018·甘肃兰州·一模 查看更多[6]
【全国市级联考】甘肃省兰州市2018届九年级中考全真模拟突破试卷数学试题山西省2018届九年级中考模拟百校联考(一)数学试题【市级联考】江苏省无锡市江阴市2019届九年级上学期期末调研考试数学试题(已下线)【万唯原创】一次函数及其应用·满分特训(三)(已下线)【万唯原创】一次函数及其应用·满分特训(二)2021年山东省临沂市罗庄区中考数学二模试题
更新时间:2018-05-02 22:11:35
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【知识点】 切线的性质和判定的综合应用解读
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解题方法
【推荐1】小明家的门框上装有一把防盗门锁(如图1).其平面结构图如图2所示,锁身可以看成由两条等弧AD,弧BC和矩形ABCD组成,弧BC的圆心是倒锁按钮点M.已知弧AD的弓形高GH=2cm,AD=8cm,EP=11cm.当锁柄PN绕着点N旋转至NQ位置时,门锁打开,此时直线PQ与弧BC所在的圆相切,且PQ∥DN,tan∠NQP=2.
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≈2.236,结果精确到0.1cm)
(1)弧BC所在圆的半径为
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【推荐2】如图等边
,以
为直径的
交
于
点,交
于
,
于
,下列结论正确的是:________ .①
是
中点;②
;③
是
的切线;④
.
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