如图,⊙O是以原点为圆心,
为半径的圆,点
是直线
上的一点,过点
作⊙O的一条切线
,
为切点,则切线长
的最小值为( )
![](https://img.xkw.com/dksih/QBM/2017/5/24/1693747036577792/1697276627238912/STEM/940b86bd62824b01842ee42056013a5c.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037686255e42bc0e93db4b66baa3115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/2017/5/24/1693747036577792/1697276627238912/STEM/940b86bd62824b01842ee42056013a5c.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2017-05-29 09:41:02
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【推荐1】点P在
的平分线上,点P到
边的距离等于3,点D是
边上的任意一点,则关于
长度的选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,
是直线
外一点,
,
,
三点在直线
上,且
于点
,
,则下列结论:①线段
是点
到直线
的距离;②线段
的长是点
到直线
的距离;③
,
,
三条线段中,
最短;④线段
的长是点
到直线
的距离.其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549110101090304/2550910618517504/STEM/7c592715-db86-42c3-9a4c-6fa6f3238522.png)
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A.②③ | B.①②③ | C.③④ | D.①②③④ |
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【推荐1】如图,四边形ABCD中,∠A=90°,AB=8,AD=6,点M,N分别为线段BC,AB上的动点(含端点,但点M不与点B重合),点E,F分别为DM,MN的中点,则EF长度的最大值为( )
![](https://img.xkw.com/dksih/QBM/2020/7/1/2496667657101312/2497367768162304/STEM/921d97d6-ea6a-4b62-92ca-abaa2e8f27e6.png)
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【推荐2】如图,
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的
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是对角线
上一点.若
,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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【推荐1】如图,在△ABC中,CF⊥AB于F,BE⊥AC于E,D为BC的中点,EF=3,BC=8,则△DEF的周长是 ( )
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,D、E分别是AB、AC的中点,连接CD、DE,过E作EF∥DC交BC的延长线于F,若△ABC的周长是14,AC的长为4,则四边形CDEF的周长是( )
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【推荐1】已知
的直径
与弦
的夹角为
,过点
作
的切线交
的延长线于点
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2023/6/22/3265393173864448/3265726901035008/STEM/cdc16db1154245c1936d2235f953ec40.png?resizew=132)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,已知⊙O圆心是数轴原点,半径为1,∠AOB=45°,点P在数轴上运动,若过点P且与OA平行的直线与⊙O有公共点,设OP=x,则x的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/3e87f533-e494-4034-829f-4c0f48541956.png?resizew=273)
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