2016高一·全国·课后作业
1 . 如图,正方形
的边长为
,
、
、
、
分别为
、
、
、
的中点.若沿
、
、
、
将四角折起,试问能折成一个四棱锥吗?为什么?你从中能得到什么结论?对于圆锥有什么类似的结论?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2017-11-27更新
|
843次组卷
|
3卷引用:同步君人教A版必修2第一章1.1.1柱、锥、台、球的结构特征
(已下线)同步君人教A版必修2第一章1.1.1柱、锥、台、球的结构特征高中数学人教版 必修2 第一章 空间几何体 1.1.1 柱、锥、台、球的结构特征人教A版 全能练习 必修2 第一章 第一节 1.1.2 简单组合体的结构特征
名校
2 . 如图,在四棱锥
中,四个侧面都是顶角为
的等腰三角形,侧棱长均为
分别是
上的点,则四边形
周长的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1006d62fa5723dc36286b8f5494f993e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58564cbeafc788e53d40ec2d1c6aba47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828fed5a1309c555773b2d935e3860b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://img.xkw.com/dksih/QBM/2017/10/4/1788206310866944/1788586433757184/STEM/9524b9d5-608b-4d1f-8df3-f2796376862b.png?resizew=240)
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2017-10-05更新
|
471次组卷
|
5卷引用:河北省邢台市2017-2018学年高二上学期第一次月考数学(文)试卷
3 . 已知侧棱长为
的正三棱锥
如图所示,其侧面是顶角为
的等腰三角形,一只蚂蚁从点
出发,围绕棱锥侧面爬行一周后又回到点
,则蚂蚁爬行的最短路程为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/09956029-1287-4942-8f01-68130022ec98.png?resizew=160)
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2017-06-18更新
|
799次组卷
|
2卷引用:四川省成都市龙泉一中、新都一中等九校2016-2017学年高一6月联考数学(理)试题
4 . 如图所示,正三棱锥
的侧棱长为1,
,
,
为棱
和
上的点,则
的周长的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf41ac607689fc291b7cba3b60f49ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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5 . 如图所示,在棱长为2的正四面体
中,
是棱
的中点,若
是棱
上一动点,则
的最小值为 ( )
![](https://img.xkw.com/dksih/QBM/2015/12/4/1572342484189184/1572342489440256/STEM/8cca938ef4d842f685e19f0cfdbcae45.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://img.xkw.com/dksih/QBM/2015/12/4/1572342484189184/1572342489440256/STEM/8cca938ef4d842f685e19f0cfdbcae45.png?resizew=230)
A.![]() | B.![]() ![]() | C.![]() | D.![]() |
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6 . 如图,在棱长为1的正四面体
中,平面
与棱
分别交于点
,则四边形
周长的最小值为___ .
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572158521057280/1572158526513152/STEM/a6c298fef49741d1bddabc711e192886.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572158521057280/1572158526513152/STEM/ffa4457710c144c7a683a3430945c914.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2015/7/1/1572158521057280/1572158526513152/STEM/111f041602984245befc929cff84f33f.png?resizew=111)
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13-14高一下·广东深圳·期中
7 . 在三棱锥
中,已知
,
, 一绳子从A点绕三棱锥侧面一圈回到点A的距离中,绳子最短距离是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b4c1ae9c57d51e27bbdb001122d3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba09a5abb8c4422468e5eb4b74c8b3f1.png)
![](https://img.xkw.com/dksih/QBM/2014/5/28/1571739210817536/1571739216273408/STEM/ae8e5d9d93574ecd98b4f62aeac2e1a0.png?resizew=111)
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11-12高二上·山东济宁·期中
8 . 在侧棱长为2
的正三棱锥P-ABC中,∠APB=∠BPC=∠CPA=40°,过点A作截面AEF与PB、PC侧棱分别交于E、F两点,则截面AEF周长的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
A.4 | B.2![]() | C.10 | D.6 |
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