已知三棱锥
的底面是边长为3的等边三角形,且
,
,平面
平面
,则该三棱锥外接球的表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93767331e9bac06a564973a9f4fc663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f36dd85f56e6144400c242667e27e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
23-24高三下·四川绵阳·阶段练习 查看更多[2]
更新时间:2024-03-29 17:46:47
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【推荐1】如图,该“四角反棱柱”是由两个相互平行且全等的正方形经过旋转、连接而成,其侧面均为等边三角形,已知该“四角反棱柱”的棱长为4,则其外接球的表面积为__________ .
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【推荐2】已知三棱锥
的三条侧棱
两两垂直,其长度分别为
.点
在底面
内的射影为
,点
所对面的面积分别为
.在下列所给的命题中,正确的有_________________ .(请写出所有正确命题的编号)
①三棱锥
外接球的表面积为
;
②
;
③
;
④若三条侧棱与底面所成的角分别为
,则
;
⑤若点
是面
内一个动点,且
与三条侧棱所成的角分别为
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766565857d28617cc4c2a26ecf76ec24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a5bde60e69bb21572ad1c4f40a6874.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8995d3243fedbd50127273ae747fe358.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bf15efd0dfaa39f0ccfdae9d6e5fe9.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d412046121178e3cb45936f1a11648d.png)
④若三条侧棱与底面所成的角分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c543ac748e62e4fee354cdfd38e830.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994c1a2ad1b47ef977df89c6bd1cf0c2.png)
⑤若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae5e7686967917e4f1bd56c45870513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394519cbafbb9832d116c09067e06a17.png)
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【推荐1】如图,在直三棱柱
中,
,
,该三棱柱存在体积为
的内切球,
为
的中点,
为棱
上的动点,当直线
、
与平面
成角相等时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
______ ,此时四面体
的外接球表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00091a5d147e2c57dcfcb62731da9ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fb457e8ac0d3ac35e1c668ea138f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458d492ab8896be57a54ec905d8e2f4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/49dc4db8-7087-4fc7-83b2-22a0e8b20322.png?resizew=176)
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【推荐2】在四棱锥
中,已知
底面
,
,
,
,
,
是平面
内的动点,且满足
.则当四棱锥
的体积最大时,三棱锥
外接球的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
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