如图,直三棱柱
的六个顶点都在半球
的球面上,
,
,
,
,则平面
截球
所得截面的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecd9b8f1d9a7b193e456b9fbaff10b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629676682059776/2629765684944896/STEM/f391b6a1-be3d-4ee6-9e2d-0e386b32a35f.png?resizew=265)
2020·全国·模拟预测 查看更多[5]
(已下线)2021年全国高中名校名师原创预测卷新高考数学(第八模拟)(已下线)2021年全国高中名校名师原创预测卷 理科数学 全国卷Ⅰ(第八模拟)(已下线)2021年全国高中名校名师原创预测卷 文科数学 (第九模拟)(已下线)2021年全国高中名校名师原创预测卷 文科数学 全国卷Ⅰ(第八模拟)(已下线)2021年全国高中名校名师原创预测卷 理科数学 (第九模拟)
更新时间:2021-01-05 20:54:53
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【推荐1】在直三棱柱
中,
,
,过
作该直三棱柱外接球的截面,所得截面的面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07956720a50ff238c0766a5d58d00e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
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【推荐2】已知正四棱柱
的底面边长
,侧棱长
,它的外接球的球心为
,点
是
的中点,点
是球
上的任意一点,有以下命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/41764a8d-626a-40d5-8143-d35e3bc1abe4.png?resizew=173)
①
的长的最大值为9;
②三棱锥
的体积的最大值是
;
③存在过点
的平面,截球
的截面面积为
;
④三棱锥
的体积的最大值为20;
其中是真命题的序号是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51f7ce48fc259dac927c95afe4ffbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/41764a8d-626a-40d5-8143-d35e3bc1abe4.png?resizew=173)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2cb6f19080f8be382b484274b2476c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031661aa4b14c3b9954ec444ad5b6f05.png)
③存在过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ae3e6e1924f2f92529860e905c9d32.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d103b4b86ded749a0e4a6255cccd8fe.png)
其中是真命题的序号是
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【推荐1】在正三棱锥
中,
,且该三棱锥的各个顶点均在以
为球心的球面上,设点
到平面
的距离为
,到平面
的距离为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2236f581b11a0bb63addd062529acee8.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423f28291495702a80a8d56bc014bf0f.png)
![](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/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2236f581b11a0bb63addd062529acee8.png)
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【推荐2】已知三棱锥
中,平面
平面
,
,则三棱锥
的外接球的大圆面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbca76bc89981f2ed0369e81990a640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
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