如图,在Rt
中,OA=OB=4
,⊙O的半径为2, 点P是AB边上的动点,过点P作⊙O的一条切线PQ(点Q为切点),则线段PQ长的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/fa198ef6-a970-431b-9051-0f04b5adc02b.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/fa198ef6-a970-431b-9051-0f04b5adc02b.png?resizew=182)
A.2![]() | B.![]() | C.1 | D.2 |
20-21九年级上·四川自贡·阶段练习 查看更多[5]
四川省自贡市贡井区田家炳中学2020-2021学年九年级上学期12月月考数学试题山东省临沂市罗庄区2021-2022学年九年级上学期期中数学试题(已下线)专题24.20 切线性质和判定定理(巩固篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)专题3.23 切线性质和判定定理(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)(已下线)专题2.6 切线性质和判定定理(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(浙教版)
更新时间:2021-01-08 23:22:58
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【推荐1】如图,
中,
,
,D是BC的中点,点E、F分别在边
、
上,且
.下列结论中正确的有( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2a65d245-d023-402d-9ba6-a96c58cdb1f6.png?resizew=235)
①
;
②
;
③
的面积S的取值范围是
;
④
.
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2a65d245-d023-402d-9ba6-a96c58cdb1f6.png?resizew=235)
①
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②
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③
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④
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,AC=3,BC=4,AD是△ABC的角平分线,若P,Q分别是AD和AC边上的动点,则PC+PQ的最小值是( )
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【推荐1】已知
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【推荐2】如图,在平行四边形
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【推荐1】Rt△ABC两直角边的长分别为6cm和8cm,则连接这两条直角边中点的线段长为( )
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【推荐2】如图,折叠矩形
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【推荐1】已知,如图,在
中,
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为直径作
分别交
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于
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两点,过
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与
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.
其中一定正确的有( )个.
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①
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【推荐2】如图所示,点Q表示蜜蜂,它从点P出发,按照着箭头所示的方向沿P→A→B→P→C→D→P的路径匀速飞行,此飞行路径是一个以直线l为对称轴的轴对称图形,在直线l上的点O处(点O与点P不重合)利用仪器测量了∠POQ的大小.设蜜蜂飞行时间为x,∠POQ的大小为y,则下列图象中,能表示y与x的函数关系的图象大致是( )
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