1 . 如图,在三棱锥
中,
为等边三角形,且
.
(1)求证:
;
(2)若面
面
,且
,求
与面
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/7be2e0ce-ca41-4e36-af7c-3057be1727dc.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
(2)若面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852a35935d668f92ed82f6baaff5ab60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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解题方法
2 . 已知三棱锥
的四个顶点在球O的球面上,
,△ABC是边长为2的正三角形,E、F分别是PA、AB的中点,EF⊥平面PAC,则球O的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fc65a72853bd8ac1ad0828270d3baf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-06-09更新
|
499次组卷
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4卷引用:湖北省咸宁市赤壁市第一中学2023-2024学年高二上学期9月月考数学试题
解题方法
3 . 已知正方体
的棱长为
,点
为
的中点,
平面
,平面
过点
,则平面
截正方体所得截面图形的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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4 . 已知三棱锥
的四个顶点都在球
的球面上,
,
,则球
的表面积为( )
![](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/afbaf3c529348b4c619e4ea6c714dd37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0595498034037b58538f8056dbc6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-03-14更新
|
5471次组卷
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12卷引用:湖北省咸宁鲁迅学校2023届高三下学期5月月考数学试题
湖北省咸宁鲁迅学校2023届高三下学期5月月考数学试题广东省广州市2023届高三综合测试(一)数学试题四川省乐山市沫若中学2022-2023学年高二下学期4月月考数学(理)试题江西省南昌市2023届高三三模数学(文)试题安徽省定远中学2023届高三下学期第二次模拟数学试卷江苏省南通市海门中学2022-2023学年高二下学期6月学情调研数学试题四川省成都市树德中学2023届高三三诊模拟数学(理)试题(已下线)专题09 立体几何初步湖南省长沙市长郡湘府中学2023-2024学年高三上学期入学考试(暑假作业检测)数学试题四川省德阳市什邡市什邡中学2023-2024学年高二上学期10月月考数学试题(已下线)题型19 10类球体的外接及内切解题技巧(已下线)第八章立体几何初步(单元测试)-【上好课】-(人教A版2019必修第二册)
5 . 四棱锥
中,侧面
是边长为
的正三角形,且与底面垂直.底面
是面积为
的菱形,
为菱形的锐角.
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634370835857408/2636131915358208/STEM/d28960f2-4231-430c-aa3f-18cf17f6bcf9.png?resizew=246)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
(2)求二面角
的度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634370835857408/2636131915358208/STEM/d28960f2-4231-430c-aa3f-18cf17f6bcf9.png?resizew=246)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479b251fdb01bae6d16abb7f2d694a7.png)
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6 . 如图,在四棱锥
中,
平面
,四边形
是菱形,
,
,且
交于点
,
是
上任意一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/a343d688-7ab6-4ba6-a8f5-d4a3e1e29152.png?resizew=129)
(1)求证
;
(2)已知二面角
的余弦值为
,若
为
的中点,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1719410d21e3de1242366ce2965e838c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/a343d688-7ab6-4ba6-a8f5-d4a3e1e29152.png?resizew=129)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
(2)已知二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5651e38293e0c42a7278af69fa53ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2019-11-06更新
|
1376次组卷
|
6卷引用:湖北省鄂南高中2019-2020学年高三上学期10月月考数学(理)试题
湖北省鄂南高中2019-2020学年高三上学期10月月考数学(理)试题湖北省武汉市华科附中、吴家山中学等五校2019-2020学年上学期高二数学期末试题2020届山东省临沂市临沭县高三上学期期末数学试题2020届湖北省武汉市新洲区高三上学期10月联考理科数学试题(已下线)专题02 从空间到平面,助力破解立体几何问题 (第四篇)-2020高考数学压轴题命题区间探究与突破江苏省连云港市板浦高级中学2020-2021学年高二上学期期末数学试题
名校
7 . 如图所示,三棱柱
中,侧面
为菱形,
在侧面
上的投影恰为
的中点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/1649b8b1-c543-4a22-98ab-9e2cf5cd918d.png?resizew=222)
(1) 证明:
;
(2) 若
,且三棱柱
的体积为
,求三棱柱
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28628f8495115d6f85bd0243a33434d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/1649b8b1-c543-4a22-98ab-9e2cf5cd918d.png?resizew=222)
(1) 证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db87b41df9d3c83d2810a4265d768d3.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7fd49bb962841b4575805030e19add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ec13ca7115ccd73a9d793758f1c170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
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2019-09-07更新
|
1425次组卷
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4卷引用:湖北省鄂南高中2019-2020学年高三上学期10月月考数学(文)试题
湖北省鄂南高中2019-2020学年高三上学期10月月考数学(文)试题安徽省合肥一中、安庆一中等六校教育研究会2020届高三上学期第一次素质测试数学(文)试题(已下线)2020届高三12月第01期(考点07)(文科)-《新题速递·数学》2020届湖北省武汉市新洲区高三10月联考试题文科数学