如图,三棱柱ABC﹣A1B1C1中,AA1⊥平面ABC,AA1=AC=2BC,∠ACB=90°.
(1)求证:AC1⊥A1B;
(2)求直线AB与平面A1BC所成角的正切值.
(1)求证:AC1⊥A1B;
(2)求直线AB与平面A1BC所成角的正切值.
![](https://img.xkw.com/dksih/QBM/2018/7/13/1987523741122560/1988912633348096/STEM/87cde7467a724dc7b53586f4ffcf2c0a.png?resizew=182)
更新时间:2018-07-15 10:36:01
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【推荐1】如图所示的五面体中,A1A,B1B,C1C都与底面ABC垂直,且∠ABC=120°,A1A=8,C1C=2,AB=BC=B1B=4.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/e1d48e20-51d0-4e93-98fc-cd1b888ddace.png?resizew=201)
(1)证明:B1A⊥平面A1B1C1;
(2)求直线AC1与平面CBB1所成的角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/e1d48e20-51d0-4e93-98fc-cd1b888ddace.png?resizew=201)
(1)证明:B1A⊥平面A1B1C1;
(2)求直线AC1与平面CBB1所成的角的正弦值.
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【推荐2】如图,已知三棱锥
的侧棱
两两垂直,且
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/636a8785-8240-4b90-9863-5ef0cb4c8904.png?resizew=236)
(1)求异面直线
与
所成角的余弦值;
(2)求AE和平面
的所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062a6c770f46e26ddb71be180d05a63c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40c32481c8ff2ea94234d8491244d45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/636a8785-8240-4b90-9863-5ef0cb4c8904.png?resizew=236)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求AE和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐3】如图,矩形ABCD中,
,
,M为边CD的中点,将
沿直线AM翻折成
,且
,点P为线段BE的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989030003204096/2989890806292480/STEM/039fe61fd6174451bddda312ccd21473.png?resizew=285)
(1)求证:
平面AME;
(2)求直线PC与平面ABM所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e323c08b18488d11bd8f3cd74efa971a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929268210da5976bc37d080da030dd.png)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2989030003204096/2989890806292480/STEM/039fe61fd6174451bddda312ccd21473.png?resizew=285)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2597b5554284e275367c25529c6750f.png)
(2)求直线PC与平面ABM所成角的正弦值.
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解题方法
【推荐1】图,在几何体
中,四边形
为等腰梯形,
,
,
,
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/52ae0b99-49ba-4cba-bc01-6f7616e939b1.png?resizew=144)
(1)证明:
;
(2)求点
到平面
的距离.
![](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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f18f1b5ebe17b068fe79bdf30d6effc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96f215c095d021b06a0ff8ede22a843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/52ae0b99-49ba-4cba-bc01-6f7616e939b1.png?resizew=144)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e8a6ed9efd3ab94d547e2209adc8eb.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
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【推荐2】如图,在四面体
中,
,平面
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94117be6898f465b621b00d996cea62a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/56ffbb5b-b88f-4c45-ba34-22b9b5c428c2.png?resizew=168)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a916d31a199e250556fb7478d9f57f7.png)
(2)若二面角
的余弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e588d344b5ea3f8069ea54a631db20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94117be6898f465b621b00d996cea62a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/56ffbb5b-b88f-4c45-ba34-22b9b5c428c2.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a916d31a199e250556fb7478d9f57f7.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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