如图,在直三棱柱
中,
,P为线段
上的动点,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/1d60154e-cbcb-42ea-a5e5-62463d948406.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ae83293789fe7367bf45b0dda77dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/1d60154e-cbcb-42ea-a5e5-62463d948406.png?resizew=140)
A.点A到平面![]() ![]() |
B.平面![]() ![]() |
C.三棱柱![]() ![]() |
D.二面角![]() ![]() |
更新时间:2022-07-09 17:00:49
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【推荐1】如图,四边形ABCD中,
,
,
,
,将
沿AC折到
位置,使得平面
平面ADC,则以下结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/e822de82-7d5c-439a-9a55-707bc871183c.png?resizew=414)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4f213703ef94cb04555ee5c68ea7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583effa35880ba5704dfc4ae4e48a6fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5975d4f63b16d5741e595e18bd4e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e830e63ba4864ef79810f823c24c5ba0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/e822de82-7d5c-439a-9a55-707bc871183c.png?resizew=414)
A.三棱锥![]() |
B.三棱锥![]() ![]() |
C.二面角![]() ![]() |
D.异面直线AC与![]() ![]() |
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【推荐2】正月十五元宵节,中国民间有观赏花灯的习俗.在2024年元宵节,小明制作了一个“半正多面体”形状的花灯(图1).半正多面体是由两种或两种以上的正多边形围成的多面体,体现了数学的对称美.图2是一个棱数为24的半正多面体,它的所有顶点都在同一个正方体的表面上,且此正方体的棱长为2.关于该半正多面体的四个结论中正确结论的是( )
A.棱长为![]() |
B.两条棱所在直线异面时,这两条异面直线所成角的大小是60° |
C.表面积为![]() |
D.外接球的体积为![]() |
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解题方法
【推荐1】如图,在四棱锥
中,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
平面
,侧面
是边长为
的正三角形,底面
为矩形,
,点
是
的中点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/93a341c4-359a-46df-b8eb-927bde38ee5e.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e8abf8690e4b129466ddb918bcc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/11/93a341c4-359a-46df-b8eb-927bde38ee5e.png?resizew=172)
A.![]() ![]() |
B.![]() ![]() ![]() |
C.点![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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解题方法
【推荐2】如图,在正方体
中,点
在线段
上运动,则( )
![](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/d7f6f93171329d508d491143b9d71f7b.png)
A.直线![]() ![]() |
B.点![]() ![]() |
C.异面直线![]() ![]() ![]() |
D.直线![]() ![]() ![]() |
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【推荐3】三棱锥
各顶点均在半径为2的球
的表面上,
,二面角
的大小为
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f17c2222ccbb93af7bc2e8c307c92ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
A.直线![]() ![]() ![]() |
B.三棱锥![]() ![]() |
C.点![]() ![]() |
D.点![]() ![]() |
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【推荐1】如图,已知正方体的棱长为1,
,
分别为正方体中上、下底面的中心,
,
,
,
分别为四个侧面的中心,由这六个中心构成一个八面体的顶点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/adc637ba-c86a-401d-82d8-22baa6be60e4.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c8942e253abf1f64b09fa7d83b9e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4955f2d54c13f08a3b7e0710858fb63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec81e9f44c1bab74c894129b09e0679.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/adc637ba-c86a-401d-82d8-22baa6be60e4.png?resizew=162)
A.直线![]() ![]() ![]() | B.二面角![]() ![]() |
C.这个八面体的表面积为![]() | D.这个八面体外接球的体积为![]() |
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【推荐2】已知菱形纸片
的边长为
,且
,将
绕
旋转
,旋转过程中记点
位置为点
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.直线![]() ![]() |
B.![]() ![]() |
C.二面角![]() ![]() |
D.旋转形成的几何体的体积为![]() |
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【推荐3】如图,在菱形ABCD中,AB=2,∠BAD=60°,将△ABD沿对角线BD翻折到△PBD位置,连结PC,则在翻折过程中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/8/5/2779785293250560/2788344519516160/STEM/434e600f-3e5e-4571-a5b5-82fa8479f2ea.png?resizew=475)
![](https://img.xkw.com/dksih/QBM/2021/8/5/2779785293250560/2788344519516160/STEM/434e600f-3e5e-4571-a5b5-82fa8479f2ea.png?resizew=475)
A.PC与平面BCD所成的最大角为45° |
B.存在某个位置,使得PB⊥CD |
C.当二面角P﹣BD﹣C的大小为90°时,PC![]() |
D.存在某个位置,使得B到平面PDC的距离为![]() |
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