把半径为
的球放在长方体纸盒内,球的一部分露出盒外,其截面如图所示,若
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/2b2b678c-fdd8-4021-af4e-d31e13eb746a.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa05aac5c1704f589339e52a1125db2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/2b2b678c-fdd8-4021-af4e-d31e13eb746a.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-12-23 16:17:58
|
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【推荐1】如图,矩形纸片
,点M、N分别在矩形的边
、
上,将矩形纸片沿直线
折叠,使点
落在矩形的边
上,记为点
,点
落在
处,连接
,交
于点
,连接
.下列结论成立的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967132918562816/2970734773919744/STEM/f4e97ff3d5e74d79be804797f4fda5cf.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dbe2aa326e2aec3acf0aa9abbfea5fb.png)
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![](https://img.xkw.com/dksih/QBM/2022/4/27/2967132918562816/2970734773919744/STEM/f4e97ff3d5e74d79be804797f4fda5cf.png?resizew=188)
A.当点![]() ![]() ![]() | B.![]() |
C.![]() | D.![]() ![]() |
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【推荐2】如图,正方形
和正方形
中,点
在
上,
是
的中点,那么
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/cd02964e-3cb4-40c5-ae1b-a10116323027.png?resizew=147)
A.12 | B.13 | C.14 | D.16 |
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名校
【推荐1】“圆材埋壁”是我国古代著名的数学菱《九章算术》中的一个问题,“今在圆材,埋在壁中,不知大小.以锯锯之,深一寸,锯道长六寸,问径几何?”用现在的数学语言表述是:“如图,
为
的直径,弦
,垂足为
,
寸,
寸,求直径
的长”.依题意,
长为( )
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714717772447744/2716105587957760/STEM/dbd23e7a-d169-4bb8-9dca-f4e430647c27.png)
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A.13寸 | B.12寸 | C.10寸 | D.8寸 |
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【推荐2】如图所示的网格中,每个小正方形的边长均为1,点A,B,D均在小正方形的顶点上,且点B,C在弧
上,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/c2c18fe0-2449-4c73-af1c-546c51deea2d.png?resizew=188)
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A.![]() | B.![]() | C.![]() | D.![]() |
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