已知四面体
是球
的内接四面体,且
是球
的一条直径,
,则下面结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3980632a0d5287e2de4bc9201313bc1c.png)
A.球![]() ![]() |
B.若![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.四面体![]() ![]() |
更新时间:2023-08-23 10:52:13
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解题方法
【推荐1】已知三棱锥D-ABC的外接球的表面积为24π,直角三角形ABC的斜边
,CD⊥BC,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe008977ee8b41b7a26580c31742139.png)
A.BC⊥平面ACD |
B.点D的轨迹的长度为2π |
C.线段CD长的取值范围为(0,2![]() |
D.三棱锥D-ABC体积的最大值为![]() |
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解题方法
【推荐2】在正四棱台
中,
,
,点
在四边形
内,且正四棱台
的各个顶点均在球
的表面上,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864734557a72fa455546d4048b713629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89802e4cb81d2947a8654eda5b56633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9df53c3a9b1c3691d8f216fd3139763.png)
A.该正四棱台的高为3 |
B.该正四棱台的侧面面积是![]() |
C.球心![]() ![]() ![]() |
D.动点![]() ![]() |
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【推荐1】扎马钉(图1),是古代军事战争中的一种暗器.如图2所示,四个钉尖分别记作
,连接这四个顶点构成的几何体为正四面体,组成该“钉”的四条等长的线段公共点为
,设
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884424741871616/2887940947001344/STEM/b5c61770-d2e4-4fdc-979a-2f81faaa5891.png?resizew=675)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db2ca6d163be93b18959beb75ac588b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884424741871616/2887940947001344/STEM/b5c61770-d2e4-4fdc-979a-2f81faaa5891.png?resizew=675)
A.![]() |
B.![]() ![]() |
C.![]() |
D.四面体![]() ![]() |
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【推荐2】设正方体
的棱长为1,点
在线段
上运动,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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
A.若点![]() ![]() ![]() |
B.若点![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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【推荐1】四棱锥
的顶点都在球心为
的球面上,且
平面
,底面
为矩形,
设
分别是
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/7395c556-f44e-475e-9858-2484532bfdc9.png?resizew=198)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd9dac6d1d58b3b6bbd29fbc7581eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108814a3d763c02025ec48c0a68903a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/7395c556-f44e-475e-9858-2484532bfdc9.png?resizew=198)
A.平面![]() ![]() ![]() |
B.四棱锥![]() ![]() |
C.![]() ![]() |
D.平面![]() ![]() ![]() |
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【推荐2】如图,矩形ABCD中,M为BC的中点,将△ABM沿直线AM翻折成△AB1M,连接B1D,N为B1D的中点,则在翻折过程中,下列说法正确的是( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/7fefdcc1-c956-49ef-86e7-ce74d071b8d8.png?resizew=162)
A.存在某个位置,使得CN⊥AB1; |
B.翻折过程中,CN的长是定值; |
C.若AB=BM,则AM⊥B1D; |
D.若AB=BM=1;当三棱锥B1-AMD的体积最大时;三棱锥B1-AMD的外接球的表面积是4π. |
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【推荐3】在棱长为1的正方体
中,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f3e4d7fa-7944-4dc7-8deb-21b457d5eb83.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f3e4d7fa-7944-4dc7-8deb-21b457d5eb83.png?resizew=161)
A.异面直线![]() ![]() ![]() |
B.四面体![]() |
C.二面角![]() ![]() |
D.正方体![]() ![]() |
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【推荐1】在棱长为1的正方体
中,点
为线段
上的动点,下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
A.存在点![]() ![]() ![]() |
B.存在点![]() ![]() ![]() |
C.存在点![]() ![]() ![]() ![]() |
D.任意点![]() ![]() |
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【推荐2】在正方体
中,
,
,
分别是
,
,
的中点,
是线段
上异于端点的动点,则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efae13e09890f0d9e0603119271172ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ce22f30a8de2af135de3c89403aff.png)
A.直线![]() ![]() | B.直线![]() ![]() |
C.存在点![]() ![]() ![]() ![]() ![]() | D.存在点![]() ![]() ![]() |
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