如图,
、
是
的切线,B、C为切点,D是
上一点,连接
、
,若
,
,则
的半径长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fe532cad7a1f9279d58874aa4def00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
A.1.5 | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-28 16:13:37
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【推荐1】如图,量角器外缘上有A、B两点所表示的读数分别是80°、50°,则∠ACB应为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/37b17a70-3414-4685-b695-063fde36573e.png?resizew=186)
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A.40° | B.30° | C.25° ![]() | D.15° |
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【推荐2】如图,在
中,
是
边上的高,⊙P是
的外接圆,连接
.若
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/251ab168-0057-4e88-8916-b2bfa142d967.png?resizew=124)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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【推荐1】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)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/3e87f533-e494-4034-829f-4c0f48541956.png?resizew=273)
A.-1≤x≤1 | B.-![]() ![]() | C.0![]() ![]() | D.0![]() |
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【推荐2】当你站在博物馆的展览厅中时,你知道站在何处观赏最理想吗?如图,设墙壁上的展品最高点P距地面2.5米,最低点Q距地面2米,观赏者的眼睛F距地面1.6米,当视角∠PEQ最大时,站在此处观赏最理想,则此时E到墙壁的距离为( )米.
![](https://img.xkw.com/dksih/QBM/2014/11/10/1573755303608320/1573755309465600/STEM/60a60236-2c6e-49e6-bdd7-c2c5f26994ce.png?resizew=139)
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【推荐1】如图,矩形纸片
中,点E是边
的中点,连结
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上,折痕为
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( )
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【推荐2】如图,在
中,
,点
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将
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顺时针旋转
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则点
的对应点
的坐标是( )
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211409137664/2462311264903168/STEM/29b5a130-ab4b-4e86-bb46-93d68d10b512.png?resizew=151)
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