如图,等边三角形ABC的边长为4,⊙C的半径为
,P为AB边上一动点,过点P作⊙C的切线PQ,切点为Q,则PQ的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/134c07d0-bdf4-4049-bb86-c79119531d33.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/134c07d0-bdf4-4049-bb86-c79119531d33.png?resizew=206)
A.3 | B.2![]() | C.3![]() | D.![]() |
2022九年级·全国·专题练习 查看更多[2]
更新时间:2022-04-28 08:09:16
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【推荐1】如图,在
中,
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A.2.4 | B.4.8 | C.9.6 | D.不确定 |
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【推荐2】如图,直线
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【推荐1】△DEF和△GHK均为等边三角形,将它们按如图1、图2的方式放置在等边三角形ABC内,若求图1、图2中的阴影部分面积的和,则只需知道( )
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【推荐2】如图,△ABC是等边三角形,AB=12,点D是BC边上任意一点,DE⊥AB于点E,DF⊥AC于点F,则BE+CF的长是( )
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【推荐2】如图,⊙O的直径AB=4,BC切⊙O于点B,OC平行于弦AD,OC=5,则AD的长为( )
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【推荐2】如图,AB是⊙O的直径,弦CD⊥AB于点E,且E为OB的中点,∠CDB=30°,CD=4
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