如图,在正方体
中,
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d10f3455309d79738c9f4c1001a64d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54dc0ff58e8c7d1035c2dff8572b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1dd5a3f83a7455eb3630364397accc.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2888214388162560/2889403956641792/STEM/c9c81985f9984b6bb2a6d5c39d441b78.png?resizew=197)
更新时间:2022-01-07 16:50:18
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【知识点】 求异面直线所成的角
相似题推荐
解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐1】如图所示,等腰直角三角形ABC中,
,
,
于点A,
于点A,若
,且E,F为DA,AC的中点,求异面直线BE与CD所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1326e85ff750d882de9ea65c29e3d3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536a2be7b84612f45cc875a00c5a5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3b3d73ff96882a0fb4d025ecc5669d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2611410719653888/2613242424967168/STEM/9233197370fa487181eb91458e3686a4.png?resizew=150)
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解答题-证明题
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较易
(0.85)
【推荐2】在四棱锥
中,侧面
底面
,侧棱
,底面
为直角梯形,其中
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2011/4/2/1570100000260096/1570100005486592/STEM/3670477fdee74b829fb7485b80058aad.png?resizew=156)
(Ⅰ)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)求异面直线
与
的夹角;
(Ⅲ)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1328e05d150f86dbe18656662eaa8f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2011/4/2/1570100000260096/1570100005486592/STEM/3670477fdee74b829fb7485b80058aad.png?resizew=156)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(Ⅲ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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