如图,在棱长为2的正方体
中,E为棱BC的中点,F为棱CD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/daa47a60-3db8-40d2-828a-1e315a4eb3ee.png?resizew=165)
(1)则直线AC1与平面
所成角的正弦值为______.
(2)则二面角
的正弦值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dfda77ecf61013170a6f43b4d9d116.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/daa47a60-3db8-40d2-828a-1e315a4eb3ee.png?resizew=165)
(1)则直线AC1与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fd7d2bc169d4467ad7d70861ed6351.png)
(2)则二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0515843e223f9643b73c4d34745d0d56.png)
更新时间:2023-01-13 16:55:04
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相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在正方体
中,正方体的棱长为2,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/162d8817-3545-4032-8bc9-e3044449f5be.png?resizew=182)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值;
(3)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/162d8817-3545-4032-8bc9-e3044449f5be.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95acc4df88e4fd0d38cf4a64f16d2dc4.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在多面体
中,等腰梯形
所在平面垂直于正方形
所在平面,
.
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680104915099648/2680395183439872/STEM/10778c96485f4c72a28e1b5deb068ef9.png?resizew=302)
(Ⅰ)求证:
平面
;
(Ⅱ)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.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/48faf8e45d629369460977a25d3c9c57.png)
![](https://img.xkw.com/dksih/QBM/2021/3/17/2680104915099648/2680395183439872/STEM/10778c96485f4c72a28e1b5deb068ef9.png?resizew=302)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,四边形
是菱形,
底面
,
,
.点E是棱
的中点.
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在三棱柱
中,
为
的中点,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/daed60ac-13a3-4272-a63a-13476d041b30.png?resizew=166)
(1)证明:
平面
;
(2)已知四边形
为边长为2的菱形,且
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cac24a2e87b6279718912162db0cd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d9bdbbdfabc737323692c796e41930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/daed60ac-13a3-4272-a63a-13476d041b30.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900e00a3609e6043af1034761d4d65f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5d02ab4d51f92d437057fd7ff9c1c1.png)
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