四棱锥
中,底面四边形
是直角梯形,
,
,
平面
,且
,
.
(1)求
与平面
所成角的大小;
(2)求平面
与平面
所成的锐二面角大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cc8f80ce821d56e3a692d02583d675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60096d11a222426d712390d3aad75ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72088bc8e553bd69d135d19adf5c550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc56a98d9e55e8bad5f119cfb704d79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3504a5eb64e8890790e3b258e03276a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/e954433d-18d1-48a0-8d04-7af3ddd30af4.png?resizew=154)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83efd6afec2f73c52e4b027a12d9f817.png)
更新时间:2023-11-14 08:42:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,由直三棱柱
和四棱锥
构成的几何体中,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498163934576640/2500047204442112/STEM/fe1c52f664124c0693b46951b3667ee7.png?resizew=126)
(1)求证:
;
(2)在线段
上(含端点)是否存在点P,使直线
与平面
所成的角的正弦值为
?若存在,求
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b3e8bee41beb61f3c4afdc554cb455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42cd4b699d8fe9f9ec24040d2e72caf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98cf9cb5b6b6de8dd40dce5628d77a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498163934576640/2500047204442112/STEM/fe1c52f664124c0693b46951b3667ee7.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6b96bb03543d40d8c7e803173e3205.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1477ae90a240deba97f8dadf4d7c41aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4fb46419d4c5868342f6615adcd36d9.png)
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解题方法
【推荐2】如图,三棱柱
中,面
面
,
.过
的平面交线段
于点
(不与端点重合),交线段
于点
.
为平行四边形;
(2)若
到平面
的距离为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425dbda940137a78a109969e66665487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70d708336d4f15e7fca0b26acb353b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bbb740f8bc13b4be8ca4dc0aef5442.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27039783266a69df2a96ea0c36cbdcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27039783266a69df2a96ea0c36cbdcd5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,三棱锥
中,平面
平面
,
为等边三角形,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ac6fb9e2-8363-478f-bcff-2694a868c682.png?resizew=240)
(1)求证:
;
(2)若
,
为线段
上一点,且
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.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/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/ac6fb9e2-8363-478f-bcff-2694a868c682.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7ebf74ae4daefad4350f9d1103a891.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09af959715e3e14e729d15cf7cf0d7ba.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,
为圆柱
的轴截面,
是圆柱上异于
,
的母线.
(1)证明:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/227ecd9e-fe50-481c-a9d4-206f25ea8293.png?resizew=142)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fd1514f6e773506df6b22f3bc7add0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1265a9b66545cc8505c19722637292.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
【推荐3】如图,在四棱锥P-ABCD中,平面
平面ABCD,PA=PD,
,
,AD=CD=2,AB=3,E是棱AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/080cffce-e033-4c60-b855-93295692faf0.png?resizew=165)
(1)证明:
平面PCE;
(2)若
,求平面PCE与平面PAB所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/080cffce-e033-4c60-b855-93295692faf0.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ad66112b09c909cab417085702ec00.png)
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