已知体积为3的正三棱锥P-ABC,底面边长为
,其内切球为球O,若在此三棱锥中再放入球
,使其与三个侧面及内切球O均相切,则球
的半径为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
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22-23高三下·河南新乡·开学考试 查看更多[3]
河南省新乡市多校联考2022-2023学年高三下学期入学测试(文科)数学试题河南省新乡市多校联考2022-2023学年高三下学期入学测试(理科)数学试题 (已下线)考点7 组合体的内切 2024届高考数学考点总动员【练】
更新时间:2023-02-06 20:08:21
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【推荐1】如图所示,正方形
的边长为2,切去阴影部分围成一个正四棱锥,则正四棱锥的侧面积取值范围为( )
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【推荐2】直观想象是数学六大核心素养之一,某位教师为了培养学生的直观想象能力,在课堂上提出了这样一个问题:现有10个直径为4的小球,全部放进棱长为a的正四面体盒子中,则a的最小值为( )
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【推荐1】如图,在三棱锥
中,
、
、
两两垂直,且
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.设
是底面
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,
,
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、
分别是三棱锥
、三棱锥
、三棱锥
的体积.若
,
,
,且
恒成立,则正实数
的最小值为( )
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【推荐2】棱长为
的正四面体内切一球,然后在正四面体和该球形成的空隙处各放入一个小球,则这些球的最大半径为( )
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【推荐1】如图1,直角梯形
中,
,取
中点
,将
沿
翻折(如图2),记四面体
的外接球为球
(
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是球
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【推荐2】已知菱形
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