名校
解题方法
1 . 已知棱长为1的正方体
,平面
与对角线
垂直,则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
A.正方体的每条棱所在直线与平面![]() |
B.平面![]() ![]() |
C.直线![]() ![]() ![]() |
D.当平面![]() |
您最近一年使用:0次
2023-05-05更新
|
1094次组卷
|
4卷引用:浙江省临海、新昌两地2023届高三下学期5月适应性考试(二模)数学试题
浙江省临海、新昌两地2023届高三下学期5月适应性考试(二模)数学试题(已下线)模块六 专题6易错题目重组卷(浙江卷)湖南师范大学附属中学2022-2023学年高一下学期第二次大练习数学试题(已下线)考点17 立体几何中的定值问题 2024届高考数学考点总动员【练】
解题方法
2 . 如图,直四棱柱
的底面是边长为2的正方形,
,
,
分别是
,
的中点,过点
,
,
的平面记为
,则平面
截直四棱柱
所得截面的面积为______ ,平面
与平面
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/ed340c65-36be-47ff-98cc-dc026b519592.png?resizew=159)
您最近一年使用:0次
解题方法
3 . 如图,在正六面体
中,
,
,
,
,过E,F,G的平面m截正六面体
得一平面多边形n.
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632461061021696/2633736375115776/STEM/d85ae0abb15b408e98fff70f43c861a6.png?resizew=159)
(Ⅰ)求多边形n的周长和面积;
(Ⅱ)求m与平面
所成的二面角的平面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60572975f9ac06ffc8d98ef94de49eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d1cbd48054865bf9b26712853e10c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632461061021696/2633736375115776/STEM/d85ae0abb15b408e98fff70f43c861a6.png?resizew=159)
(Ⅰ)求多边形n的周长和面积;
(Ⅱ)求m与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
名校
解题方法
4 . 在《九章算术》中,将四个面都为直角三角形的四面体称之为鳖臑.如图,在鳖臑
中,
平面
,
,且
,过点
分别作
于点
,
于点
,连结
,当
的面积最大值时,
( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/afa03cdd-5cd6-4624-9ddf-ead2147f4780.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9fd9540710e56838940d36d8a4802e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc216d456790748fda154e2c73d0c4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/afa03cdd-5cd6-4624-9ddf-ead2147f4780.png?resizew=153)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次