如图,三棱柱
在圆柱中,等腰直角三角形
,
分别为上、下底面的内接三角形,点
,
分别在棱
和
上,
,
,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/6d627668-83b4-423c-9100-afe8d40f7821.png?resizew=148)
(1)求
的值;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f6657ad109972ea7a5246b4d8190ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8956290b197fc8d124329ef068d9e1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/6d627668-83b4-423c-9100-afe8d40f7821.png?resizew=148)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fb0e2d5a48a0cf57fe9258e058fc12.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8340db80fbc422d538f3583eaeb571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
更新时间:2021-05-27 22:55:24
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相似题推荐
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【推荐1】如图,在四棱锥
中,
底面ABCD,
,
,
,
,点E为棱PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/be503ace-39ff-416d-bda1-df9c2f935574.png?resizew=185)
1
证明:
;
2
求BE的长;
3
若F为棱PC上一点,满足
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51fc7d1b20a1ce1761714c1733f0511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729d5cb74bb927aa549ce596a35b26b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b175a9ea8c1c191810c1e324a5a9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fa8832f98b5418a7d75892f7951b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/be503ace-39ff-416d-bda1-df9c2f935574.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e25d646e74788c6a47fe0e88b0cc4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a389e0b0232e986d1c341b45e5b28e.png)
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【推荐2】如图所示,四边形
是直角梯形,
平面
.
(1)求
与平面
所成角的正弦值;
(2)求平面
和平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e11a0375f0890025a23971deadfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7a5547fd1e117de548cfb86b072bfb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/9a7cef7c-8437-48c4-ba8f-9e89c4c9eb04.png?resizew=172)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26ca000cd3c0e285cb4acf011802041.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
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【推荐1】如图所示的几何体中,
平面
,
,四边形
为菱形,
,点
,
分别在棱
,
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/23ef1cf9-dab4-4ec3-93e0-e853bf202bf2.png?resizew=178)
(1)若
平面
,设
,求
的值;
(2)若
,
,直线
与平面
所成角的正切值为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c766942d554e7f15ffec6eaacbe0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bebae04c72b934bfbbf0b4d01f164f.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/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/23ef1cf9-dab4-4ec3-93e0-e853bf202bf2.png?resizew=178)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f83d5a903efd3a93822b00c35e35892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99ac4caf9374271222d75f149af3e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/488bf8e67dcc6bb8680eecaaf2d7b541.png)
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【推荐2】如图菱形ABCD和平面四边形ABEF的面积相等,且菱形ABCD和平面四边形ABEF所在平面互相垂直,ΔABE是等腰直角三角形形,AB=AE,∠EAF=30°,∠BAD=120°
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/c3a6803b-1e0a-4a77-827a-4c80cd9ed975.png?resizew=242)
(1)设P是线段CD上一点,且
,在直线AE上是否存在一点M,使得PM∥平面BCE?若存在,指出点M的位置,并证明你的结论;若不存在,请说明理由.
(2)求二面角F-BD-A的正切值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/c3a6803b-1e0a-4a77-827a-4c80cd9ed975.png?resizew=242)
(1)设P是线段CD上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4116192e460c0e74bc73a9aa32155e.png)
(2)求二面角F-BD-A的正切值.
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