1 . 已知正四棱柱
中,底面边长为2,
,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/194db13f-1625-43eb-a485-54d7cd547612.png?resizew=165)
(1)求异面直线
与
所成角的大小;(用反三角函数值表示)
(2)若直线
平面
所成角大小为
,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/194db13f-1625-43eb-a485-54d7cd547612.png?resizew=165)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3f4d2809dd4eb3e1df385ebfdcaf6c.png)
您最近一年使用:0次
2 . 被嘉定著名学者钱大昕赞誉为“国朝算学第一”的清朝数学家梅文鼎曾创造出一类“方灯体”,“灯者立方去其八角也”,如图所示,在棱长为
的正方体
中,点
为棱上的四等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/8033fbda-c25e-4863-bb8c-a41ceef63c4d.png?resizew=209)
(1)求该方灯体的体积;
(2)求直线
和
的所成角;
(3)求直线
和平面
的所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560b6c42bdce1d950245a5e1ed37537f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/8033fbda-c25e-4863-bb8c-a41ceef63c4d.png?resizew=209)
(1)求该方灯体的体积;
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be0c48c7f4a070e0d7f4de345679367.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0b46fa6746c09ef4120e7256326151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd8081131102151e01fcaf6ee67acd4.png)
您最近一年使用:0次
3 . 在平行四边形
中,
过
点作
的垂线交
的延长线于点
,
.连结
交
于点
,如图1,将
沿
折起,使得点
到达点
的位置.如图2.
证明:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cdb19af3fe72be6542fb0d94f285b2.png)
若
为
的中点,
为
的中点,且平面
平面
求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc97c60d1d177f28113ea511a61d3931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cdb19af3fe72be6542fb0d94f285b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b77a5c3865855fbb3d24f9522ced8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c707f0202ec1aa233e1eeacc7a4587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48769011a648f0b274a3f1acb8531758.png)
![](https://img.xkw.com/dksih/QBM/2019/4/3/2174654959190016/2175408525426688/STEM/9a1066c8-fe22-4924-988d-24a33cc08c70.png)
您最近一年使用:0次
2019-04-04更新
|
912次组卷
|
8卷引用:江西省南昌县莲塘县第三中学2019-2020学年高二下学期期末考试数学(理)试题
18-19高一·全国·单元测试
名校
4 . 某个几何体的三视图如图所示(单位:m),
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/f07867f1-1ba6-4bf3-b25a-dc4c1acb897f.png?resizew=179)
(1)求该几何体的表面积(结果保留π);
(2)求该几何体的体积(结果保留π).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/f07867f1-1ba6-4bf3-b25a-dc4c1acb897f.png?resizew=179)
(1)求该几何体的表面积(结果保留π);
(2)求该几何体的体积(结果保留π).
您最近一年使用:0次
2019-02-09更新
|
600次组卷
|
7卷引用:安徽省芜湖市2019-2020学年高二上学期期末数学(理)试题
安徽省芜湖市2019-2020学年高二上学期期末数学(理)试题安徽省合肥市第十一中学2020-2021学年高二上学期期中数学(理)试题安徽省阜阳市颍上第二中学2020-2021学年高二上学期第一次月考数学(理)试题(已下线)章末检测1(课后作业)-2018-2019版数学创新设计课堂讲义同步系列(人教A版必修2)(已下线)第01章 章末检测(A)-2018-2019版数学创新设计课堂讲义同步系列(人教A版必修2)(已下线)第01章 立体几何初步(A)-2018-2019版数学创新设计课堂讲义同步系列(北师大版必修2)广西玉林市第十一中学2020-2021学年高一3月份月考数学试题
5 . 如图1,在直角梯形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f4904a29df8c5bf72ae0fafefddab5.png)
,
是
的中点,
是
与
的交点,将
沿
折起到图2中
的位置,得到四棱锥
.
平面
;
(Ⅱ)当平面
平面
时,四棱锥
的体积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f4904a29df8c5bf72ae0fafefddab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7519926ccf1dd1ec7bfccad11bbd78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04e2f190be01e1ae0a21eb44e4dce83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db2b1c641b93caae9b7a82441e4ba70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eddaf3f33bd9a99162c061c9dd99aee.png)
(Ⅱ)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44c1843ff6150ebc6aad3e34e477d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db2b1c641b93caae9b7a82441e4ba70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397c38c95a7c8e7c1e13a89622a31bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2019-01-30更新
|
5796次组卷
|
34卷引用:2015-2016学年四川省资阳市高二上学期期末质量检测文科数学试卷
2015-2016学年四川省资阳市高二上学期期末质量检测文科数学试卷广东省汕头市金山中学2017-2018学年高二上学期期末考试数学(文)试题2015-2016学年江西省上高县二中高二上学期第一次月考数学试卷2016-2017学年山西大同一中高二理10月月考数学试卷北京市十一学校2016-2017学年高二上学期期中考试数学(理)试题【全国百强校】山东省寿光现代中学2017-2018学年高二6月月考数学(文)试题【全国百强校】黑龙江省鹤岗市第一中学2017-2018年度高一下学期期末文数试题【全国百强校】安徽省合肥一六八中学2018-2019学年高二上学期期中考试文科数学(凌志班)试题江西省吉安县二中2019-2020学年高二上学期期中考试数学试题江苏省南通市海门市2020-2021学年高三上学期期末数学试题广东省广雅中学2021-2022学年高二上学期期中数学试题沪教版(2020) 必修第三册 精准辅导 第11章 单元测试第11章 简单几何体(单元提升卷)-2022-2023学年高二数学考试满分全攻略(沪教版2020必修第三册)2015年全国普通高等学校招生统一考试文科数学(陕西卷)2016届江西省南昌市二中高三上第四次考试文科数学试卷2016届河北省衡水中学高三下六调文科数学A卷2015-2016学年贵州花溪清华中学高一6.25周练数学卷(已下线)二轮复习【文】专题12 空间点、线、面的位置关系 押题专练人教B版 必修2 必杀技 第一章 全章训练人教A版(2019) 必修第二册 过关斩将 第八章 专题强化练6 平面与平面垂直人教A版(2019) 必修第二册 必杀技 第8章 素养检测陕西省西安市高新一中、交大附中、师大附中2019-2020学年高三上学期1月联考数学(文)试题(已下线)专题06 空间中的平行与垂直-备战2021届高考数学(文)二轮复习题型专练?(通用版)(已下线)解密06 空间点、线、面的位置关系(讲义)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练山西省太原市第五中学2021届高三下学期二模数学(文)试题(已下线)考点33 直线、平面垂直的判定及其性质-备战2022年高考数学(文)一轮复习考点帮(已下线)收官卷02--备战2022年高考数学(文)一轮复习收官卷(全国乙卷)(已下线)收官卷02--备战2022年高考数学(文)一轮复习收官卷(全国甲卷) 苏教版(2019) 必修第二册 必杀技 第13章 立体几何初步 素养检测上海市实验学校2023届高三上学期11月月考数学试题湖北省襄阳市第四中学2021-2022学年高一下学期5月月考数学试题(已下线)第八章 本章综合--数学思想训练【第二练】“上好三节课,做好三套题“高中数学素养晋级之路(已下线)专题23 立体几何解答题(文科)-3专题32立体几何与空间向量解答题(第二部分)
6 . 如图,在以
、
、
、
、
、
为顶点的五面体中,
是平行四边形,
,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/e4d63113-d1e7-44ca-b0b9-66f63e8cb321.png?resizew=202)
(1)求证:
;
(2)若
,
,
与平面
所成角为
,求该五面体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386c7de62e8f9a8161ebaefe6b4ec35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07b92b8282c7fd1158b3b5098e38c39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/e4d63113-d1e7-44ca-b0b9-66f63e8cb321.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dcbe075165566acf363cd199f07ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
您最近一年使用:0次
2019-01-20更新
|
807次组卷
|
3卷引用:【市级联考】四川省雅安市2018-2019学年高二上学期期末考试数学(文)试题
名校
解题方法
7 . 如图,
分别是正方体
的棱
,
的中点,棱长为
,
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
//平面
.
(2)求正方体
外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f8accdb21a85e7251360bdb6b6953a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89851b6a4fe58a8a042d6a97c4eb317.png)
(2)求正方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
2018-10-19更新
|
1126次组卷
|
2卷引用:江西省吉安市白鹭洲中学2022-2023学年高二上学期期末考试数学试题
8 . 如图,四边形
是等腰梯形,
,
,
,在梯形
中,
,且
,
平面
.
(1)求证:平面
平面
;
(2)若二面角
的大小为
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ea8ab3d191cebcb69e087f7b3263ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68dfd32a77c3615069ad1e7eb5b226a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3471bde9ec2c95cc301b4b3f468ca4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02b6df2041ef74bd8a80c9f1ab7cf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1077520a4816bbb5a37fc45359e34c5c.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5680c88274fe3de009b76721b1128e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b69099d2b74ffbb1f365e1468bd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/dd31f439-617e-4b56-8166-1a1c8d2b2d5c.png?resizew=133)
您最近一年使用:0次
2018-02-09更新
|
503次组卷
|
2卷引用:重庆市第一中学2017-2018学年高二上学期期末考试数学(理)试题
9 . 《九章算术》是我国古代内容极为丰富的数学名著,书中将底面为直角三角形的直棱柱称为堑堵,将底面为矩形的棱台称为刍童.在如图所示的堑堵
与刍童
的组合体中
,
. 台体体积公式:
, 其中
分别为台体上、下底面面积,
为台体高.
(1)证明:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
平面
;
(2)若
,
,
,三棱锥
的体积
,求 该组合体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d762c010dbf90d25bb4b72c849db3e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c4c7a4907d5b9158775555855ee441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193a893997674f5f50711b4bfea0943f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087c865604b5ffe5db9d0474f68348c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b006143c991165cd8c9f6fe11831b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3acdab98dbc9b6c859bfe0f12d4556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac20024c3622b78dfaa2f4ef75714dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6e289041a1a25a475d5bfa6f99ef5b.png)
![](https://img.xkw.com/dksih/QBM/2018/2/5/1875664359833600/1876342579200000/STEM/f63cbf652b2546568f5e9d209667b890.png?resizew=265)
您最近一年使用:0次
2018-02-06更新
|
422次组卷
|
4卷引用:湖北省宜昌市第一中学2017-2018学年高二上学期期末考试数学(文)试题
10 . 如图,在四面体
中,
平面
,
,
,
为
的中点.
(1)求证:
;
(2)求二面角
的余弦值.
(3)求四面体
的外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903e252094f04331047fe92335aac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7c852fd8c45896789034a578be274b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c7f31a3c7724e968a7dd08652bc4f4.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
(注:如果一个多面体的顶点都在球面上,那么常把该球称为多面体的外接球. 球的表面积)
您最近一年使用:0次