如图,在四棱柱
中,底面
和侧面
均为矩形,
,
,
,
.
(1)求证:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68a44992693cc6bbfa489a59a9e00cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502fc5e3c7f636aac9064ec69018c95c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/c728c8bb-3c17-4f5b-a853-1ed0e171d2be.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967bd1d8bd38f6be7931eef41db106.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e793c52fdd16cc602eaf753964ec02.png)
更新时间:2023-08-20 13:57:47
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知
是底面边长为1的正四棱柱,
为
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ce8661db-5735-4e0b-8871-25a8eb4b9655.png?resizew=172)
(1)设
与底面
所成角的大小为
异面直线
与
所成角的大小为
求证: ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5932db8195eab6c776d37f694aadc84.png)
(2)若点C到平面
的距离为
求正四棱柱
的高;
(3)在(2)的条件下,若平面
内存在点P满足P到线段BC的距离与到线段
的距离相等,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/ce8661db-5735-4e0b-8871-25a8eb4b9655.png?resizew=172)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2813b1870eb5c43664820f461a75b402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3544c836718677375096543237755954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5932db8195eab6c776d37f694aadc84.png)
(2)若点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39099f98d1a9d10cd0fb6692cb0c13cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(3)在(2)的条件下,若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab96f97a5e202ba9220bac5280e4f3.png)
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名校
【推荐2】如图,在四棱锥
中,
面
,
,
为线段
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/47447b69-4e20-4f6c-adde-a0e7cbb35ea8.png?resizew=178)
(1)证明:
平面
;
(2)若
是
的中点,求
与平面
所成的角的正切值;
(3)在(2)的条件下求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/85a9249c3b4c6e22262c6bac3cafccf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76ce75f28a122167457b390eda064e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/47447b69-4e20-4f6c-adde-a0e7cbb35ea8.png?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)在(2)的条件下求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,在三棱锥
中,
.
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0292075eed1fe000b524bce7c40043d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/8e8cde28-0a38-4c7d-9ae3-c2104e36ab47.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
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解题方法
【推荐2】在正三棱锥
中,
,点
在线段
上.过点
作平行于
和
的平面
,分别交棱
于点M,N,O.
(1)证明:四边形
为矩形;
(2)若
,求多面体MNPOBC的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c6b0a6cb307c4c02f503831862f7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d0abaa4e36f9675f849c300dff7056.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/b0c010cf-ca18-4bd2-8d6f-4ade61823669.png?resizew=130)
(1)证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ee04f40f79d73e803b91530e208330.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8de90eb325adb8122baa14c7e49f703.png)
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解答题-问答题
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(0.65)
【推荐3】如图,在三棱锥
中,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/4f7e314a-17ef-4e36-b762-d8324d1adee8.png?resizew=143)
(1)证明:
;
(2)求侧面
与底面
所成二面角的大小;
(3)求三棱锥的体积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc755e20d7e1d4efacf2a73d704ac24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3c5d2cbe5cfa47fde68ff3b5b81469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918f551b689e0eb45e0ff6796af74d8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/4f7e314a-17ef-4e36-b762-d8324d1adee8.png?resizew=143)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8337d3e8670a9ed0165ac853b80af3d9.png)
(2)求侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(3)求三棱锥的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b04a4591698f4f2a472f7ed6088674.png)
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