已知正方体
的棱长为1,点
为
的中点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
A.![]() | B.![]() ![]() |
C.点![]() ![]() ![]() | D.![]() ![]() ![]() |
更新时间:2023-04-11 15:58:49
|
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适中
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【推荐1】已知正三棱柱的各条棱长都是2,
,
分别是
,
的中点,则( )
A.![]() ![]() |
B.平面![]() ![]() ![]() |
C.三棱锥![]() ![]() ![]() |
D.若正三棱柱![]() ![]() ![]() ![]() |
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解题方法
【推荐2】设P为圆锥的顶点,O为圆锥底面圆的圆心,点M在线段PO上,且
,
是底面圆的内接正三角形,AD为底面圆的直径,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba9e27786cf5f137cfbc7e9837a0f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634e91a3d04eb1b522444cb2378c05da.png)
A.![]() |
B.直线PD与OC所成角的余弦值为![]() |
C.在圆锥侧面上,点A到PD中点的最短距离为![]() |
D.三棱锥![]() ![]() |
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【推荐1】如图所示,在棱长为1的正方体
中,
为
的中点,直线
交平面
于点
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
A.![]() ![]() ![]() | B.点C到平面![]() ![]() |
C.![]() ![]() | D.直线![]() ![]() ![]() |
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【推荐2】(多选)《九章算术》是我国古代的数学名著,书中将底面为矩形,且有一条侧棱垂直于底面的四棱锥称为阳马.如图,在阳马
中,
平面ABCD,底面
是正方形,且
,E,F分别为PD,PB的中点,则( )
![](https://img.xkw.com/dksih/QBM/2023/9/21/3329798116155392/3330168983699456/STEM/d6357ef4ebcd4cc0a5603bf226684a8e.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://img.xkw.com/dksih/QBM/2023/9/21/3329798116155392/3330168983699456/STEM/d6357ef4ebcd4cc0a5603bf226684a8e.png?resizew=172)
A.![]() | B.![]() |
C.点F到直线CD的距离为![]() | D.点A到平面EFC的距离为![]() |
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【推荐3】如图,在菱形
中,
,
,将
沿对角线
翻折到
位置,则在翻折的过程中,下列说法正确的( )
![](https://img.xkw.com/dksih/QBM/2021/6/28/2752953704308736/2780992896638976/STEM/2ea46b7d-1999-4654-9ac1-a4459248d0ea.png?resizew=396)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://img.xkw.com/dksih/QBM/2021/6/28/2752953704308736/2780992896638976/STEM/2ea46b7d-1999-4654-9ac1-a4459248d0ea.png?resizew=396)
A.存在某个位置,使得![]() |
B.存在某个位置,使得![]() |
C.存在某个位置,使得![]() ![]() ![]() ![]() ![]() |
D.存在某个位置,使得点![]() ![]() ![]() |
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【推荐1】如图,
为正方体,下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690596602945536/2691867807670272/STEM/3c78de2cdebd48acb8062bce1fd943d8.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690596602945536/2691867807670272/STEM/3c78de2cdebd48acb8062bce1fd943d8.png?resizew=156)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() ![]() |
D.过点![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图,点M为正方形ABCD的中心,N为等边
的边BE的中点,平面
平面ABCD,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/ca2dfb91-6a42-4a10-86c8-058da1a6133d.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/ca2dfb91-6a42-4a10-86c8-058da1a6133d.png?resizew=170)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() ![]() |
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【推荐1】已知四面体
的所有棱长均为2,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() |
B.点![]() ![]() ![]() |
C.四面体![]() ![]() |
D.动点![]() ![]() ![]() ![]() ![]() |
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【推荐2】已知正方体
的棱长为
,点
,
是棱
,
的中点,点
是侧面
内运动(包含边界),且
与面
所成角的正切值为
,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/6a2f6a9d-92a8-46a7-9cd0-45755f8326db.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.![]() ![]() | B.存在点![]() ![]() |
C.存在点![]() ![]() ![]() ![]() | D.所有满足条件的动线段![]() ![]() |
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