如图,在边长为2的正方形
中,E,F分别为
,
的中点,H为
的中点,沿
,
,
将正方形折起,使B,C,D重合于点O,构成四面体,则在四面体
中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016805854396416/3019031825457152/STEM/ea1eb3254de04021b56c3b25d8d64bca.png?resizew=131)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd7177a1af632169e5f4740c1b50d6b.png)
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016805854396416/3019031825457152/STEM/ea1eb3254de04021b56c3b25d8d64bca.png?resizew=131)
A.四面体的体积为![]() | B.![]() ![]() |
C.![]() | D.四面体外接球的半径为![]() |
21-22高一下·江苏淮安·期末 查看更多[2]
更新时间:2022-07-09 20:18:53
|
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适中
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解题方法
【推荐1】正方体
的棱长为4,动点
,
在棱
上,
,动点
在棱
上,则三棱锥
的体积( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebecdc0f0f815ff0083d85d3f539b36d.png)
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A.与点![]() | B.与点![]() ![]() |
C.与点![]() ![]() ![]() | D.三棱锥![]() ![]() |
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【推荐2】正方体
的棱长为1,
为线段
,
上的动点,过点
的平面截该正方体的截面记为S,则下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3770aa1bf6a441811db0aec1d27a7ea1.png)
A.当![]() ![]() |
B.当![]() ![]() ![]() ![]() ![]() ![]() |
C.当M为![]() ![]() |
D.当M为![]() ![]() ![]() ![]() |
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解题方法
【推荐1】如图,正三棱柱
中,
是
的中点,
是
的中点,
,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.![]() ![]() ![]() |
B.该三棱柱有内切球(球与棱柱的每个面都相切) |
C.该三棱柱外接球的体积为 ![]() |
D.平面 ![]() ![]() |
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解题方法
【推荐2】如图,在四面体
中,
,
,若用一个与
,
都平行的平面
截该四面体,下列说法中正确的( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/8b1cd06e-1904-42b0-8750-1eafb16e3d6c.png?resizew=228)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279e119eed905cf15026649a1b86502a.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/17/8b1cd06e-1904-42b0-8750-1eafb16e3d6c.png?resizew=228)
A.异面直线![]() ![]() |
B.平面![]() ![]() |
C.平面![]() ![]() |
D.该四面体的外接球半径为![]() |
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【推荐1】已知正方形ABCD的边长为4,点E在线段AB上,
.沿DE将
折起,使点A翻折至平面BCDE外的点P,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
A.存在点P,使得![]() | B.存在点P,使得直线![]() |
C.不存在点P,使得![]() | D.不存在点P,使得四棱锥![]() |
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【推荐2】已知三棱锥
的各顶点都在球
上,点
分别是
的中点,
平面
,
,
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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A.![]() ![]() |
B.球![]() ![]() |
C.二面角![]() ![]() |
D.平面![]() ![]() ![]() |
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