如图,在四棱锥
中,底面
是矩形,
平面
,
,
,
是
上一点,且
.求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79a2100ec3a85bab03f88f23bd0b20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c520811bf03682fddddb9b1e4b2c5423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/86bddbdf-318a-40a8-b8a5-f270d1034a84.png?resizew=183)
更新时间:2023-10-08 20:23:09
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示的几何体中,四边形
为正方形,AD∥B
,平面ABC⊥平面BC
,AB=AC=
,AD=1,∠ABC=45°.
![](https://img.xkw.com/dksih/QBM/2018/4/10/1921080087732224/1921933463035904/STEM/0189994175af42f996bd532810fdd0a0.png?resizew=180)
(1)求证:AB⊥CD;
(2)求点C到平面D
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5e200f75bd87382187a3ef7804f3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e1abac2c301863b08dba67bbee4b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57eb6cf4970d30717525c8261e4334de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/2018/4/10/1921080087732224/1921933463035904/STEM/0189994175af42f996bd532810fdd0a0.png?resizew=180)
(1)求证:AB⊥CD;
(2)求点C到平面D
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0100aaf730f5c5ddab0ba5ed2fa6b22.png)
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名校
【推荐2】如图,四棱锥
的底面
为平行四边形,
,
.
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050767771582464/2055716089749504/STEM/66cabfff470a4264bdb91cdbb743a9d8.png?resizew=183)
(1)求证:
;
(2)若
,
,
,求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7250d3955ca3fa0607e2356496e8a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208779e7d75e0bf9250a1abe7f6c5467.png)
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050767771582464/2055716089749504/STEM/66cabfff470a4264bdb91cdbb743a9d8.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49f5b71689e65004adadd76f77302ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef6c5034bf231b38a51747b72c44d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/112fa01f635540ff9d75387810748800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3bd9c2db8c9f3cb8c6c7d7cbf5465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
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解答题-问答题
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适中
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【推荐1】如图,在三棱锥P-ABC中,AB=AC,D为BC的中点,PO⊥平面ABC,垂足O落在线段AD上.已知BC=8,PO=4,AO=3,OD=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/9/847941f1-c59c-4805-8afb-10c33cd45617.png?resizew=156)
(1)证明:AP⊥BC;
(2)若点M是线段AP上一点,且AM=3,试证明AM⊥平面BMC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/9/847941f1-c59c-4805-8afb-10c33cd45617.png?resizew=156)
(1)证明:AP⊥BC;
(2)若点M是线段AP上一点,且AM=3,试证明AM⊥平面BMC.
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【推荐2】已知向量
,
.
(1)当
与
平行时,求实数
的值;
(2)当
与
垂直时,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e53ecd812a19f3c4061299116901e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0f77a2cc6cb2e7876bf92cb590b849.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d489c43eb011491d16393bfba6774c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b57d4b52fc04039f5a5f8c9c6163748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877cb99be948fc1f0b0937569aa099fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c08c1d025f7f40129fe19536bcd422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
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【推荐1】如图,在四棱锥P-ABCD中,
平面ABCD,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ff75415f-e17e-42ba-8966-a7bea4a710d4.png?resizew=129)
(1)证明:
;
(2)求二面角
的余弦值;
(3)设Q为线段PD上的点,且直线AQ和平面PAC所成角的正弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/ff75415f-e17e-42ba-8966-a7bea4a710d4.png?resizew=129)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
(3)设Q为线段PD上的点,且直线AQ和平面PAC所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d74ef32584586ec4857acd0a3f4fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a4eae6cd9bd7c514e6298ddcf81001.png)
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解题方法
【推荐2】如图,已知四棱锥
的底面为直角梯形,
,
,
,平面
平面ABCD,
,
.
(1)求证:
平面ABCD;
(2)若
,当平面EAC与平面ABCD的夹角的余弦值为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a272a69b8ea97971cfd1c4b24b4c4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1862fdf8aeff84cee13c873b15d82a4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/f584f90a-57d9-4935-87d5-cdc024788025.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006d4d1564318a466854c0241a6eb775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337379328fdf7c8f79ac1d702529ff48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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