如图,在棱长为2的正方体
中,点E、F分别为
、
的中点.
平面
:
(2)求异面直线EF与AB所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)求异面直线EF与AB所成角的余弦值.
更新时间:2024-02-12 19:04:15
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解答题-证明题
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【推荐1】如图,在三棱锥
中,
,D是BC的中点,
⊥平面
,垂足O落在线段AD上,已知
,
,
,
.
(1)求证:
.
(2)若点M是线段AP上一点,且
,求平面ABC与平面BCM的夹角余弦.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72d83915b41102495fcff91dbdbb0b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90bd1ffa355edcdc023b5a6b47ca7526.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/dac7488f-9b1f-4217-a036-4b5ba78bc990.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbad7ad1465d1c4c177e3321e6ed12a.png)
(2)若点M是线段AP上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3432d20e661779ddcefda76afcc2ac.png)
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【推荐2】在正四棱柱
中,
,点
在线段
上,且
,点
为
中点.
到直线
的距离;
(2)求证:
面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95196d4658088f565e495c005cfed5a4.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/457f98ffd408dc7aeef865072df168d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
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解题方法
【推荐1】如图,在长方体
中,
,
,E为AB中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/4aecab72-ca7f-4d8c-856f-c2efe2e59c81.png?resizew=162)
(1)求直线
与
所成角的余弦值;
(2)求点B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d64fc81c857b124268609a8beb77b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/4aecab72-ca7f-4d8c-856f-c2efe2e59c81.png?resizew=162)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
(2)求点B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f233b375753611ffa7a93c2c12ef5e28.png)
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【推荐2】如图,在四棱锥P-ABCD中,底面ABCD是矩形,
平面ABCD,
,
,M是PD上一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957282879627264/2958029651247104/STEM/c2327403-ca48-45bd-b8c3-f0b75a58db4f.png?resizew=155)
(1)求异面直线PB与CM所成角余弦的大小;
(2)求点M到平面PAC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79a2100ec3a85bab03f88f23bd0b20e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957282879627264/2958029651247104/STEM/c2327403-ca48-45bd-b8c3-f0b75a58db4f.png?resizew=155)
(1)求异面直线PB与CM所成角余弦的大小;
(2)求点M到平面PAC的距离.
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