如图1,圆O的内接四边形
中,
,
,直径
.将圆沿
折起,并连接
、
、
,使得
为正三角形,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/fa1e9412-2c55-4d83-a859-a32d01660735.png?resizew=289)
(1)证明:图2中的
平面
;
(2)在图2中,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ed407cbb778f76bf879bfcae69ebba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c646c683fbe522edb7ea54fd3ad873d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/fa1e9412-2c55-4d83-a859-a32d01660735.png?resizew=289)
(1)证明:图2中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)在图2中,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63a158f3cd698827a5099a09ba6d7e.png)
更新时间:2023-04-30 22:08:16
|
相似题推荐
【推荐1】如图,平面
平面
,且四边形
与四边形
是正方形.
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3032c7935adaaa2d3c17bd7bcb5fbf.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
,
为线段
,
的中点,
(1)证明:
⊥平面
;
(2)若直线
与平面
所成的角大小为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/23cb0178-66a4-40c2-8d1c-112200f84457.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
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解答题-证明题
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适中
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【推荐1】在多面体
中,四边形
与
是边长均为4正方形,
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/20/1573031639203840/1573031645618176/STEM/d317196b04cc4987896cf62d5e6ca9cc.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20e38a1b5cfffd43a3405481a1d67cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ebadb3ab4718c0e388ce44c978d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/2016/9/20/1573031639203840/1573031645618176/STEM/d317196b04cc4987896cf62d5e6ca9cc.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0149a639635b31717ddad7dfec0a63c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ccce05caa88496e5bd9f9a3a0f5552.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图①:在平行四边形
中,
,
,将
沿对角线
折起,使
,连结
,得到如图②所示三棱锥
.
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445403369545728/2445651735617536/STEM/1eb317508b284f46a8a3f8254406a0c6.png?resizew=392)
(1)证明:
平面
;
(2)若
,二面角
的平面角的正切值为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f392cf697f88fc22678b5d02cbffb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87136d5f4908fa04dd99bc35a16f393.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
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