已知三棱锥的四个顶点都在球
的球面上,
,
,E,F分别是PA,AB的中点,
,
,
,则球
的体积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-02-06 14:47:51
|
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【推荐1】已知四棱锥
中,底面
是边长为4的正方形,平面
平面
,且
为等边三角形,则该四棱锥的外接球的表面积为( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在三棱锥
中,
是以AC为底边的等腰直角三角形,
是等边三角形,
,又BD与平面ADC所成角的正切值为
,则三棱锥
外接球的表面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,已知正方形
和正方形
所在平面成60°的二面角,则直线
与平面
所成角的正弦值为( ).
![](https://img.xkw.com/dksih/QBM/2020/12/6/2608299215020032/2613909336686592/STEM/eaf7d60d-2dcc-4a9e-bbf7-ad8d432c63a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图是四棱锥
的平面展开图,四边形
是矩形,
,
,
,
,
.在四棱锥
中,
( )
![](https://img.xkw.com/dksih/QBM/2021/11/2/2842695221264384/2844575737036800/STEM/76b9603efc024d0aa11b92705db1f242.png?resizew=264)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da6e90f9c9617cd495abb57ab9b0e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae1783f9ee7b5332fb56301c380eb0a.png)
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![](https://img.xkw.com/dksih/QBM/2021/11/2/2842695221264384/2844575737036800/STEM/76b9603efc024d0aa11b92705db1f242.png?resizew=264)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知正六棱锥
的侧棱长为
,底面边长为2,点
为正六棱锥
外接球上一点,则三棱锥
体积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b7838a53d0b3ed4565fb6a890f365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b7838a53d0b3ed4565fb6a890f365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76b4fee9bdac62a4a070e74d35f83e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/934b56ac-cfe3-458d-a67e-f5f79d2e546d.png?resizew=169)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在棱长为1的正方体
中,P为棱
的中点,Q为正方形
内一动点(含边界),则下列说法中不正确 的是( )
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082428759613440/3082833397030912/STEM/4d8efa58d1de47fe8ad6aaeef5805373.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72545bef56c4e32d1b76489bd32c3842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86814dbae9a5343d69bb4647900b3bfe.png)
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A.若![]() ![]() |
B.存在Q点,使得![]() ![]() |
C.当且仅当Q点落在棱![]() ![]() |
D.若![]() ![]() |
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