1 .
年,欧拉在给哥德巴赫的一封信中列举了多面体的一些性质,其中一条是:如果用
、
和
表示闭的凸多面体的顶点数、棱数和面数,则有如下关系:
.已知正十二面体有
个顶点,则正十二面体有( )条棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596de144fb8929e0f608a9d1b8a9d019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.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/0c91c4472879d107d42da5b07fab777e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-11-30更新
|
1117次组卷
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12卷引用:东北师范大学附属中学2021届高三第五次模拟考试文科数学试题
东北师范大学附属中学2021届高三第五次模拟考试文科数学试题云南师范大学附属中学2021届高考适应性月考卷(四)数学(文)试题云南师范大学附属中学2021届高考适应性月考卷(四)数学(理)试题云南大学附属中学呈贡校区2021届高三上学期第四次月考理科数学试题(已下线)专题21 数学文化(客观题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题22 数学文化(客观题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)(已下线)专题18 高考中的数学文化-2021年高考冲刺之二轮专题精讲精析(已下线)专题23 数学文化(客观题)-2021年高考数学(理)二轮复习热点题型精选精练吉林省长春市东北师大附中2021届高三五模数学(文)试题安徽省合肥市长丰县衡安学校2020-2021学年高二下学期第四次调研考试理科数学试题江苏省南通市海安县曲塘中学2020-2021学年高二上学期阶段性测试二数学试题(已下线)艺体生一轮复习 第七章 立体几何 第30讲 立体图形的结构特征与直观图【练】
解题方法
2 . 某几何体的三视图如图所示,则该几何体的表面积为( )
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498191819513856/2499162485710848/STEM/b722d974f53d4b9a8be7fc0ea3ec543d.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498191819513856/2499162485710848/STEM/b722d974f53d4b9a8be7fc0ea3ec543d.png?resizew=135)
A.![]() | B.![]() | C.13 | D.18 |
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解题方法
3 . 已知
,动点
在以
为直径的圆上(不与
,
重合),
为等边三角形,当三棱锥
的体积最大时,它的外接球的表面积是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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4 . 如图①,在等腰梯形
中,
,
,
.
,交
于点
.将
沿线段
折起,使得点
在平面
内的投影恰好是点
,如图.
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498191819513856/2499162486284288/STEM/c109f8f070bc4fdb8f1a892b9a792fef.png?resizew=329)
(1)若点
为棱
上任意一点,证明:平面
平面
.
(2)在棱
上是否存在一点
,使得三棱锥
的体积为
?若存在,确定
点的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498191819513856/2499162486284288/STEM/c109f8f070bc4fdb8f1a892b9a792fef.png?resizew=329)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819d4f24c9e0f0dd1718912732cfe7ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab8a10e675354fa0c6e7da3d06b999d.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250c98fd67e327d38969308c9a743d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6595f862f1b3dfc3e8ec0331c8cc9ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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5 . 如图,网格纸上小正方形的边长为1,粗线画出的是某多面体的三视图,则该多面体外接球的表面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/65125266-b00b-4781-a8d7-7ba127c6db24.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/65125266-b00b-4781-a8d7-7ba127c6db24.png?resizew=193)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 如图一几何体三视图如图所示,则该几何体外接球表面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/af3f45e0-e7e4-4100-832f-1f68fa1f309f.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/af3f45e0-e7e4-4100-832f-1f68fa1f309f.png?resizew=197)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
7 . 已知三棱锥
四个顶点均在半径为
的球面上,且
,
,若该三棱锥体积的最大值为
,则这个球的表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4957406b21df59fdf7fa184752287b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
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2020-04-28更新
|
406次组卷
|
4卷引用:2020届辽宁省葫芦岛市协作校、锦州市高三文科数学一模试题
8 . 如图,在四棱锥
中,侧面
是等边三角形,且平面
平面
、E为
的中点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cd2f7547-6b57-42e1-a98b-70f4b4e95a72.png?resizew=230)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/cd2f7547-6b57-42e1-a98b-70f4b4e95a72.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d492a2248463e0c0199a25d0f76d23.png)
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解题方法
9 . 某三棱锥的三视图如图所示,则该三棱锥的体积为_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/62ea6414-c04d-4dc7-8e4f-c5c8b0f6aa86.png?resizew=260)
您最近一年使用:0次
2020-02-05更新
|
194次组卷
|
2卷引用:2020届辽宁省葫芦岛市普通高中高三上学期学业质量监测(期末)数学(理)试题
解题方法
10 . 如图所示,已知球O为棱长为3的正方体
的内切球,则平面
截球O的截面面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/049d0710-35e5-4853-a05f-9327329ec295.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/049d0710-35e5-4853-a05f-9327329ec295.png?resizew=146)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-02-05更新
|
1663次组卷
|
6卷引用:2020届辽宁省葫芦岛市普通高中高三上学期学业质量监测(期末)数学(理)试题
2020届辽宁省葫芦岛市普通高中高三上学期学业质量监测(期末)数学(理)试题2020届辽宁省葫芦岛市普通高中高三上学期学业质量监测(期末)数学(文)试题2020届高三2月第02期(考点07)(理科)-《新题速递·数学》沪教版(2020) 必修第三册 精准辅导 第11章 11.4(1)球(已下线)专题14 截面问题(已下线)8.3.2圆柱、圆锥、圆台、球的表面积和体积(精讲)(2)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)