在如图所示的圆锥中,
、
、
是该圆锥的三条不同母线,
、
分别为
、
的中点,圆锥的高为
,底面半径为
,
,且圆锥的体积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/81836ae9-b5cf-4910-a3bc-10142a05a62d.png?resizew=165)
(1)求证:直线
平行于圆锥的底面;
(2)若三条母线
、
、
两两夹角相等,求平面
与圆锥底面的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a6909c754c5f8f6ebdf9ad6c284e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63850c0f9ba71c7d6f20903707b2d98e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/81836ae9-b5cf-4910-a3bc-10142a05a62d.png?resizew=165)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)若三条母线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588690c4a218025937357ffab8d63c7a.png)
2022·陕西西安·一模 查看更多[3]
更新时间:2022-05-18 20:15:40
|
相似题推荐
解答题-证明题
|
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解题方法
【推荐1】如图,在四棱锥P﹣ABCD中,AD=4,BC=CD=2,PA=PC=PD,AD∥BC且AD⊥DC,O,M分别为AC,PA的中点.
![](https://img.xkw.com/dksih/QBM/2022/6/13/3000627971309568/3001010846343168/STEM/b15472e9438f48b48ed13d1ace3fa041.png?resizew=195)
(1)求证:BM∥平面PCD;
(2)求证:PO⊥平面ACD;
(3)若二面角P﹣CD﹣A的大小为
,求四棱锥P﹣ABCD的体积.
![](https://img.xkw.com/dksih/QBM/2022/6/13/3000627971309568/3001010846343168/STEM/b15472e9438f48b48ed13d1ace3fa041.png?resizew=195)
(1)求证:BM∥平面PCD;
(2)求证:PO⊥平面ACD;
(3)若二面角P﹣CD﹣A的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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名校
【推荐2】如图,在四棱锥
中,底面
为直角梯形,且
,
,侧面
底面
. 若
.侧棱
上是否存在点
,使得
平面
?若存在,指出点
的位置并证明,若不存在,请说明理由.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa6508d6820f972de28c360aea7504.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/460516ee9c61f1bdd231759be0033e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/10/26/2837755294769152/2838563528663040/STEM/c6184288444f4a518547ab44d8ea21e7.png?resizew=325)
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【推荐1】如图,在直四棱柱中,底面
为等腰梯形,
,
,
,
,E、F、G分别是棱
、
、
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959627455283200/2961623715569664/STEM/edf41cbc-f34e-446b-ab80-ffe8482d11b4.png?resizew=184)
(1)证明:直线
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4aa43d2e64e857267e706e1f50f5c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959627455283200/2961623715569664/STEM/edf41cbc-f34e-446b-ab80-ffe8482d11b4.png?resizew=184)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27088b6faa6117fe59cdb4af87f0bcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a456b9e47c1dc1ca65494bf60518994b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67888ea7bc85eeec8b25fa487531d4ff.png)
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【推荐2】在四棱锥P﹣ABCD中,DA⊥平面PAB,DC∥AB,DA=DC=2,AB=AP=4,∠PAB=120°,M为PB中点.
(Ⅰ)求证:CM∥平面PAD;
(Ⅱ)求二面角M﹣AC﹣B的余弦值.
(Ⅰ)求证:CM∥平面PAD;
(Ⅱ)求二面角M﹣AC﹣B的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/4353bdee-f3ad-4889-a49b-ed3348e7c0c5.png?resizew=193)
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