如图所示,正方体
中,E,F分别是正方形
和
的中心,G是
的中点,设GF,
与AB所成的角分别为α,β,则α+β等于( )
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838490624/STEM/dba9d069f4414561aa1515d173cdeb03.png?resizew=216)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e516121599c9fcc528121c00afcf52fc.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679833305088/1570679838490624/STEM/dba9d069f4414561aa1515d173cdeb03.png?resizew=216)
A.120° | B.60° | C.75° | D.90° |
12-13高一上·四川成都·阶段练习 查看更多[2]
更新时间:2016-12-01 12:59:13
|
【知识点】 求异面直线所成的角
相似题推荐
单选题
|
适中
(0.65)
【推荐1】已知正三棱柱
既有外接球也有内切球,则异面直线
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
(0.65)
名校
解题方法
【推荐2】已知在底面为菱形的直四棱柱
中,
,若
,则异面直线
与
所成的角为( )
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629766680559616/2629807345893376/STEM/588e4845-e55d-406d-ad76-d2c1f5e5722d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24638c3526907f8370af25ad77b3efe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629766680559616/2629807345893376/STEM/588e4845-e55d-406d-ad76-d2c1f5e5722d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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