如图,正方形
与等腰直角△ACB所在的平面互相垂直,且AC=BC=2,
, F、G分别是线段AE、BC的中点.求
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe21ae075d3cc8e51cecec73747011d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570130142838784/1570130148114432/STEM/910934eb818343b6914e06bff195e728.png)
11-12高二上·海南·期末 查看更多[1]
(已下线)2010-2011学年海南省洋浦中学高二年级第一学期期末考试理科数学卷
更新时间:2016-11-30 18:20:52
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【知识点】 求异面直线所成的角
相似题推荐
【推荐1】在长方体
中,
,
,点E是棱AB上的点,当
.
(1)求异面直线
与EC所成角的大小;
(2)求此时点C到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02c25b95e61557eec096de150ab873f.png)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
(2)求此时点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ecd8e274cebd92bd814ef7158b50fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/f34a3590-5d88-412f-99b6-060c95b62a6a.png?resizew=155)
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【推荐2】一个正方体的平面展开图及该正方体的直观图的示意图如图所示,在正方体中,设
的中点为
,
的中点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/0f398ff7-caf1-42e0-ab34-af18e8b721b5.png?resizew=421)
(1)请将字母
标记在正方体相应的顶点处(不需说明理由);
(2)求直线
与直线
夹角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/0f398ff7-caf1-42e0-ab34-af18e8b721b5.png?resizew=421)
(1)请将字母
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a8f3a13cb258c61e2a221c2bf09979.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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