如图,四边形
为菱形,O为
与
的交点,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/c330dabe-0d2b-4c9b-ab62-03ea6f77505f.png?resizew=142)
(1)求证:平面
平面
;
(2)若
,求
与平面
所成角的正弦值;
(3)若
,三棱锥
的体积为
,求三棱锥
的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/c330dabe-0d2b-4c9b-ab62-03ea6f77505f.png?resizew=142)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa99c9e32c26c441503d4e7794178c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb8837a125041127658ef850e6656ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b565e518d475a50358fedff2f0bb8dec.png)
更新时间:2021-01-28 23:34:57
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,平面
平面
,四边形
是菱形,
.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988292849590272/2989128809947136/STEM/bb583df3-41cf-4be9-9075-3083e02c46fd.png?resizew=182)
(1)求四棱锥
的体积;
(2)在
上有一点
,使得
,求
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a4e3f0349fa83dc2a0b7d798f04843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aa887e521b16b852c11dd0fa155370.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988292849590272/2989128809947136/STEM/bb583df3-41cf-4be9-9075-3083e02c46fd.png?resizew=182)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b854a0d664fdd2fbd9b9bf743b94d484.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c2c719827e151b33e1c79f4aadc3e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,四边形
为直角梯形,
,
,平面
平面
,
分别为
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4bd817a-2232-4c2b-8055-7acd35e29434.png?resizew=197)
(I)求证:平面
平面
;
(II)求三棱锥
的体积.
![](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/90ff6d7dd48b57f03d82d2c522ee9b94.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/b4c591629994e061d2578b5c54d2b24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40bea87ae1d98d54ca869f97c3b24532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8254b52b379a420c17d38334940b073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5729dd997ea7e8cb4cef8b7165b36e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d4bd817a-2232-4c2b-8055-7acd35e29434.png?resizew=197)
(I)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c51c4a1148587943fe9ba210f6141ee.png)
(II)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffb7a7a6d15786daa7fb370d80f0b54.png)
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适中
(0.65)
【推荐1】如图,在四棱锥
中,底面
是边长为
的菱形,
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/14a56f99-4e37-4c3c-a3cd-398a26ae39ce.png?resizew=182)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5578cd49feb7c846f087b041371c3875.png)
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37505861cb6bd5dd3c95da992510c3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4880fb0525c66e064d697f9db2dda287.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/14a56f99-4e37-4c3c-a3cd-398a26ae39ce.png?resizew=182)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5578cd49feb7c846f087b041371c3875.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16c23dd291bf7e824bd6c02831f5c56.png)
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【推荐2】如图,在直三棱柱
中,
,
,
.点
、
、
分别在线段
、
、
上,且
,
.
(1)证朋:
;
(2)若
,且平面
将直三棱柱
的体积平分.求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f66f1308e0feb67fa5e1946b4965358.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1693155ed4514978277c6090520b4bf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/b1a88e27-cec1-4b2a-b2f5-4acb7dd1c219.png?resizew=136)
(1)证朋:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c0583576eb52299048703e3125367.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35db81b5546261dd8c6aff1185fd6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fa7ff056747ebdc342dc2ddf1b4b16.png)
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【推荐3】如图,直三棱柱
中,
,
,
是棱
上的动点.
(1)证明:
;
(2)若平面
分该棱柱为体积相等的两个部分,试确定点
的位置,并求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512cc5f78111d4592f6d843db6915f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896d66e2af642634094aec5187f29a21.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e0254c84e44728749b34c08c28ab1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/a67addaa-0f90-4b73-ac71-a465065696be.png?resizew=146)
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适中
(0.65)
【推荐1】如图,在四面体
中,平面
平面
,
,
分别为
的中点,
,
.
在平面
内;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8922620e649f55d79118cbabf947a8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4b28bee93514bc11f9a1b442d132c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191d0e26c283e0a223c8144947b3a2ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384438c5fe01746c04b73701b8eb8206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0635059fd390592d1851dfe56c72cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108cc1a2c8c4fa4b2d4fae65218d6021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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解题方法
【推荐2】如图,已知
平面ACD,
平面ACD,三角形ACD是正三角形,且
,F是CD的中点.
平面CDE;
(2)求直线EF与平面CBE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb59a3752da728cfa77557dd14d0f737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06781fd124cad40fa5fd120b074157f.png)
(2)求直线EF与平面CBE所成角的正弦值.
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【推荐1】直三棱柱
中,
,D为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/bb98dce7-1ba3-4235-8126-63e106553e15.png?resizew=130)
(1)求证:平面
平面ABD;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf929a4acfed060c5f159754fe137393.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/bb98dce7-1ba3-4235-8126-63e106553e15.png?resizew=130)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3a59d7bf91a7540e35ce0011ad9b97.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162e1adbd2e18e412bfd924b78068d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e98058f394b0d5b4d8498b2dcfa3983.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
,
,
,
,点
为
的中点.平面
交侧棱
于点
,四边形
为平行四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/bc7e7ef5-6826-4f69-a5d4-0f8311f95d51.png?resizew=184)
(1)求证:平面
平面
;
(2)若二面角
的余弦值为
,求
与平面
所成角的正弦值.
![](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/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/bc7e7ef5-6826-4f69-a5d4-0f8311f95d51.png?resizew=184)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d77d19204d12a34986025a453e2f3de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次