如图,正三棱锥
和正三棱锥
的侧棱长均为
,
.若将正三棱锥
绕
旋转,使得点
分别旋转至点
处,且
四点共面,点
分别位于
两侧,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/10b6472e-d579-47dc-9207-1c98e464856b.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f2d2ef6661d1808fed0cbd1b0fa53d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff571c72c041d8668b4d2754679f64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de83ce4d5ad4bb47d74cbd3bc3394ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e5d9f7e63d80a1969318ac999a3e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e925a4d4d706168d1ae69167483096c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/10b6472e-d579-47dc-9207-1c98e464856b.png?resizew=137)
A.![]() |
B.![]() ![]() |
C.二面角![]() ![]() |
D.多面体![]() ![]() |
22-23高一下·福建三明·期中 查看更多[3]
福建省三明第一中学2022-2023学年高一下学期期中考试数学试题(已下线)高一数学下学期第二次月考02(范围:平面向量,解三角形,复数,立体几何)江苏省盐城市五校2022-2023学年高一下学期5月联考数学试题
更新时间:2023-04-26 18:01:48
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解题方法
【推荐1】如图圆柱内有一个内切球,这个球的直径恰好与圆柱的高相等,
为圆柱上下底面的圆心,
为球心,
为底面圆
的一条直径,若球的半径
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A.球与圆柱的体积之比为![]() |
B.四面体![]() ![]() |
C.平面![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐2】如图所示,已知正方体
的棱长为1,点E、F、G分别是
、AD、BC中点,连结
、AC分别交EF、FG于S、K两点,则下面选项叙述正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/cd4d9bfb-21b0-4a9f-9061-1c96a993c75c.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.四棱锥![]() ![]() |
B.![]() |
C.平面DSK被四棱锥![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐3】如图,在四面体
中,平面
平面
,
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A.四面体![]() ![]() |
B.![]() |
C.二面角![]() ![]() |
D.四面体![]() ![]() |
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解题方法
【推荐1】如图动点
在正四棱锥
表面上运动, 正四棱锥各棱长均为1,
与DA所成角等于CE与
所成角, 记为
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A.动点E形成的轨迹是正三角形 |
B.动点![]() |
C.![]() ![]() |
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【推荐2】如图,在四棱锥
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A.在棱![]() ![]() ![]() ![]() |
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C.直线![]() ![]() ![]() |
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【推荐1】在正方体
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A.![]() ![]() | B.![]() ![]() |
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【推荐2】如图,矩形ABCD中,E、F分别为BC、AD的中点,且
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A.![]() | B.存在点P,使得![]() |
C.存在点P,使得![]() | D.三棱锥![]() ![]() |
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【推荐1】在长方体
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A.![]() |
B.![]() |
C.三棱锥![]() ![]() |
D.二面角![]() ![]() |
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【推荐2】在四面体
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A.二面角![]() ![]() |
B.二面角![]() ![]() |
C.![]() |
D.![]() ![]() |
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