1 . 如图,四棱锥的底面是正方形,顶点
在底面上的投影是底面正方形的中心,侧棱长为
,侧面的顶角为
.过点
作一截面与
、
、
分别相交于
、
、
,则四边形
周长的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585235716481024/2585588662714368/STEM/f824dcf43351493886d4d85251835f1c.png?resizew=147)
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5卷引用:浙江省金华市磐安县第二中学2020-2021学年高二上学期10月竞赛数学试题
浙江省金华市磐安县第二中学2020-2021学年高二上学期10月竞赛数学试题(已下线)考点27 空间几何体的结构及其三视图与直观图-备战2021年高考数学(文)一轮复习考点一遍过(已下线)考点28 空间几何体的结构及其三视图与直观图-备战2021年高考数学(理)一轮复习考点一遍过(已下线)第一章+空间几何体(基础过关)-2020-2021学年高一数学单元测试定心卷(人教版必修2)海南省北京师范大学万宁附中2020-2021学年高一下学期期中考试数学试题
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2 . 如图:正三棱锥
中,
,侧棱
,
平行于过点
的截面
,则平面
与正三棱锥侧面交线的周长的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/c205461b-ea5d-4f6f-9956-d97ac1a37554.png?resizew=155)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d03dc7bb044da0863b871064a6748e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/c205461b-ea5d-4f6f-9956-d97ac1a37554.png?resizew=155)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 在正三棱锥
中,
,
,一只蚂蚁从点A出发沿三棱锥的表面爬行一周后又回到A点,则蚂蚁爬过的最短路程为_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0dfa72f9c88567f58a8100c497326f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07887aef4e13473bcb590c1ab1b0e4a.png)
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4 . 如图,底面为正方形的四棱锥
中,四条侧棱相等,且
,
,
分别为棱
和
上的两点,
,
,
处有只蚂蚁欲沿该正四棱锥的侧面爬行到
处,则蚂蚁爬行的最短距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a93880cc479398d2f5ed1bedbe4dc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a84b05b69041348a1c56a208995347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.![]() | B.![]() | C.![]() | D.9 |
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2020-09-02更新
|
894次组卷
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3卷引用:四川省凉山州2019-2020学年高一下学期期末考试数学(理)试题
5 . 正三棱锥
中,若
,
,点
、
分别在侧棱
、
上运动,则
的周长的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19f0fcacac715a1200770516d1e4a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca068887d0a25263dd63a7945b56aac.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
A.![]() | B.![]() | C.12 | D.![]() |
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解题方法
6 . 在三棱锥
中,
,
在底面
上的投影为
的中点
,
.有下列结论:
①三棱锥
的三条侧棱长均相等;
②
的取值范围是
;
③若三棱锥的四个顶点都在球
的表面上,则球
的体积为
;
④若
,
是线段
上一动点,则
的最小值为
.
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0526ffd579731e183e18702551b3596a.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab04ed01b17326fd467d62afdc754c9.png)
③若三棱锥的四个顶点都在球
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5aedb7470128f1782be91f5f444a6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1907eb3d298da8c9cf0490b0d33df3af.png)
其中正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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5卷引用:四川省成都市2020届高中毕业班第三次诊断性检测理科数学试题
四川省成都市2020届高中毕业班第三次诊断性检测理科数学试题安徽省阜阳市太和第一中学2020-2021学年高二(普通班)上学期期中数学试题安徽省阜阳市太和第一中学2020-2021学年高二(奥赛班)上学期期中数学试题(已下线)第31练 直线、平面垂直的判定与性质-2021年高考数学(文)一轮复习小题必刷山西省晋城市2020-2021学年高二上学期期中数学(理)试题
7 . 如图,在棱长为1的正方体
中,
分别为
上的动点,则
周长的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1326682214940a8f033d6a0cf70a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4303d39b1ef204190e9a6b4cd2dd5e8f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图,三棱锥
中
,
,
分别为
上的点,则
周长的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df5b52a17f185f91b79994465ea0be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57ea3de1e2308c1240da30af9706b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62718bb9eb6df7abeb6dcd9805b0b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/24c65971-27ed-4989-a5e7-ef87aa8e2fe8.png?resizew=144)
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9 . 现有边长为3,4,5的两个三角形纸板和边长为4,5,
的两个三角形纸板,如图,用这四个纸板围成一个四面体,则这个四面体的体积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db98d5309e420e7c638deca07a5b3e52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/e413f8d6-c30d-4851-be60-8da9c29ebe96.png?resizew=369)
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10 . 将一块正方形纸片先按如图1所示的阴影部分截去四个全等的等腰三角形,然后将剩余部分沿虚线折叠并拼成一个体积为
的四棱锥模型,该四棱锥底面是正方形,从顶点向底面作垂线,垂足是底面中心.将该四棱锥如图2放置,若其正视图为正三角形,则正方形纸片的边长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41bbced6026f9512afa005638c6e5c4.png)
![](https://img.xkw.com/dksih/QBM/2020/3/25/2427243720679424/2427415027171328/STEM/7d3d6aa5c76340b3acbd1bd61e6d483f.png?resizew=267)
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|
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5卷引用:2020届河南省名校(南阳一中、信阳、漯河、平顶山一中四校)高三3月线上联合考试数学(文)试题
2020届河南省名校(南阳一中、信阳、漯河、平顶山一中四校)高三3月线上联合考试数学(文)试题(已下线)第四篇数学文化03-2020年高考数学选填题专项测试(文理通用)江西省宁冈中学2020-2021学年高二上学期期中考试数学(理)试题江西省赣州市赣县第三中学2021-2022学年高二下学期开学考试数学(理)试题(已下线)8.1基本立体图形(第1课时棱柱、棱锥、棱台的结构特征)(精讲)-【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)