正三棱柱
中,所有棱长均为2,点
分别为棱
的中点,若过点
作一截面,则截面的周长为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/0794a891-a47a-4245-b2c6-d1a1486abf05.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef4495309b23e5218be6f611d04c38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8e45b50c77bf6a2cde628ea3455ac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/0794a891-a47a-4245-b2c6-d1a1486abf05.png?resizew=128)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2019-01-26 09:18:23
|
相似题推荐
单选题
|
较难
(0.4)
【推荐1】如图,棱长为
的长方体
中,
为线段
上动点(包括端点).则以下结论正确的为( )
![](https://img.xkw.com/dksih/QBM/2021/2/2/2649630773452800/2653421974405120/STEM/a7c54cbdfce34ababf2ae342fdcae63d.png?resizew=277)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/2021/2/2/2649630773452800/2653421974405120/STEM/a7c54cbdfce34ababf2ae342fdcae63d.png?resizew=277)
A.三棱锥![]() ![]() ![]() ![]() |
B.过点![]() ![]() ![]() ![]() |
C.直线![]() ![]() ![]() |
D.当点![]() ![]() ![]() ![]() |
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解题方法
【推荐2】如图,棱长为1的正方体
中,
为线段
上的动点(不含端点),则下列结论错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/4e0b63bf-aaf1-459c-b606-6a06faeadbe7.png?resizew=166)
![](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/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/4e0b63bf-aaf1-459c-b606-6a06faeadbe7.png?resizew=166)
A.直线![]() ![]() ![]() |
B.平面![]() ![]() |
C.三棱锥![]() |
D.平面![]() |
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【推荐1】如图,在直三棱柱
中,
,
,E、F、G、H分别为
、
、
、
的中点,则下列说法中错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ef5a1361ddf48f47a1f8fdb6c08e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
A.![]() |
B.E、F、G、H四点共面 |
C.设![]() ![]() ![]() |
D.![]() ![]() ![]() |
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解题方法
【推荐2】如图,在正四棱柱
中,
,过点
作垂直于直线PC的截面
,则以
为顶点,截面
为底面的棱锥的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d2710536d2e17b9adba6a2aa3085ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.42 | B.48 | C.56 | D.63 |
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【推荐1】如图,在棱长为1的正方体
中,点
分别是棱
,
的中点,
是侧面
内一点,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
平面
,则线段
长度的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/1/ad9b7cad-1439-4919-b759-6ce3a6a725bf.png?resizew=167)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】设正方体
的棱长为1,与直线
垂直的平面
截该正方体所得的截面多边形为
,则
的面积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次