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1 . 在如图所示的三棱锥A-BCD中,BD=2,DC=3,∠DAB+∠BAC+∠DAC=90°,∠ADB=∠BDC=∠ADC=90°.现有一只蚂蚁从点D出发经三棱锥A-BCD的三个侧面绕行一周后回到点D,则蚂蚁爬行的最短距离为_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/a93f4839-e464-4a12-958c-6d812cb9b825.png?resizew=145)
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2019-06-06更新
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529次组卷
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4卷引用:【全国百强校】湖北省荆州市沙市中学2018-2019学年高一5月月考数学试题
【全国百强校】湖北省荆州市沙市中学2018-2019学年高一5月月考数学试题人教B版(2019) 必修第四册 逆袭之路 第十一章 11.1.4 棱锥与棱台四川省宜宾市叙州区第二中学校2023-2024学年高三上学期开学考试理科数学试题(已下线)11.2 锥体(第1课时)(七大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020必修第三册)
2 . 如图,圆形纸片的圆心为
,半径为
,该纸片上的正方形
的中心为
,
、
、
、
为圆
上点,
,
,
,
分别是以
,
,
,
为底边的等腰三角形,沿虚线剪开后,分别以
,
,
,
为折痕折起
,
,
,
,使得
、
、
、
重合,得到四棱锥.当该四棱锥体积取得最大值时,正方形
的边长为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/3ca4eaa7-9a51-4a38-b844-44e0b30674d6.png?resizew=170)
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