已知四棱锥
的底面
为菱形,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb217a74ff4ff3e007052e936bb9a47.png)
,
,
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/4ff91e52-c765-4e83-9c8e-b02e8b6d7e7c.png?resizew=211)
(1)求证:
底面
;
(2)求直线PB与平面PCD所成角的大小的正弦值.
![](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/ebb217a74ff4ff3e007052e936bb9a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2551d93b674b9f8bcd0e88454c99eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/4ff91e52-c765-4e83-9c8e-b02e8b6d7e7c.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线PB与平面PCD所成角的大小的正弦值.
更新时间:2023-03-13 10:49:59
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相似题推荐
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在多面体
中,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980507953512448/2981348181131264/STEM/b78888ba-b05d-4835-ba12-67d3f8b11adb.png?resizew=200)
(1)证明:
平面
;
(2)若
,点
在棱
上且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633bf2de732ae51fc06ef3d559915da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980507953512448/2981348181131264/STEM/b78888ba-b05d-4835-ba12-67d3f8b11adb.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.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/6e427f81a17321b48dd6b437fb3a5c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfb3aa3ca8a2e7d7b737687a3829506.png)
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【推荐2】如图,在四棱锥P-ABCD中,底面ABCD为正方形,
底面ABCD,
,E为线段PB的中点.
![](https://img.xkw.com/dksih/QBM/2020/10/20/2575294481719296/2575933490249728/STEM/b9926f9e-676f-4b83-932c-808473a01c47.png?resizew=288)
(1)若F为线段BC上的动点,证明:
平面PBC;
(2)若F为线段BC,CD,DA上的动点(不含A,B),
,三棱锥A-BEF的体积是否存在最大值?如果存在,求出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://img.xkw.com/dksih/QBM/2020/10/20/2575294481719296/2575933490249728/STEM/b9926f9e-676f-4b83-932c-808473a01c47.png?resizew=288)
(1)若F为线段BC上的动点,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
(2)若F为线段BC,CD,DA上的动点(不含A,B),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
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【推荐3】如图所示,正方形
所在平面与梯形
所在平面垂直,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/a25c7a7e-6fbe-4e2a-8491-a07077838946.png?resizew=219)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)在线段
上是否存在一点
,使得二面角
的余弦值为
,若存在求出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bbfc08d48bf80a35b84c3d12b0714a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2a2dd759ee5e7948d4d8dc6780162f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048c053ec9544bb287a89322508ca1bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f53ada78ee7339a2fa0f4d09c3e624.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/a25c7a7e-6fbe-4e2a-8491-a07077838946.png?resizew=219)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ea3d098fae87d8a2adc3f9913d8a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe67036b4671b5d2a5c55b48c4d3bb9.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52b0a12e4770a56f6fc747976f4cd7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0575326fe48bfd6a08298998175e959.png)
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【推荐1】如图,已知
与
所在平面相互垂直,且∠BAC=∠BCD=90°,
,CB=CD,点P,Q分别在线段BD,CD上,沿直线PQ将△PQD向上翻折,使D与A重合.
![](https://img.xkw.com/dksih/QBM/2014/9/5/1571850744897536/1571850750246912/STEM/274811273d3944c2837d3c8211f897ec.png?resizew=280)
(1)求证:AB⊥CQ;
(2)求BP的长;
(3)求直线AP与平面BCD所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://img.xkw.com/dksih/QBM/2014/9/5/1571850744897536/1571850750246912/STEM/274811273d3944c2837d3c8211f897ec.png?resizew=280)
(1)求证:AB⊥CQ;
(2)求BP的长;
(3)求直线AP与平面BCD所成的角.
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【推荐2】如图所示,在三棱柱
中,侧棱垂直于底面ABC,且底面是边长为2的正三角形,侧棱长为1,D是AC的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/1/2927010464915456/2935459797983232/STEM/6cfb5172-6f4b-467a-b429-badf8dc3dcca.png?resizew=171)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2927010464915456/2935459797983232/STEM/6cfb5172-6f4b-467a-b429-badf8dc3dcca.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5ea494bb75a5c04e61c9e32aceabc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0fbd88fdb064072eedd136e9cb41ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
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【推荐3】如图,在三棱锥
中,平面
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9a7faf59-e6c1-4da5-93eb-79aca8bc4b5f.png?resizew=163)
(Ⅰ)证明:
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f4d90625e27f60f693cdc0a8f9b081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae40084257baa17b166abc34a816f55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9a7faf59-e6c1-4da5-93eb-79aca8bc4b5f.png?resizew=163)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52347c0ee2a318b4a9bd93af9ddea46.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
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解题方法
【推荐1】如图,在四棱锥
中,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/0aa40c41-fb03-4936-a31d-7622d483b3f9.png?resizew=164)
(1)当
时,证明:平面
平面
;
(2)当四棱锥
的体积为
,且二面角
为钝角时,求直线
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/63e8b4cee42df0bc0a7a0c0cb56ef1c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57af480a5e2c688723d762b822fa51e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/2/0aa40c41-fb03-4936-a31d-7622d483b3f9.png?resizew=164)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8825d400f453c5c17a7beeb1cc9a9cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c911b404bbb8f8d5f1470585fa31ad97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图,菱形
的边长为2,
,E为AB的中点.将
沿DE折起,使A到达
,连接
,
,得到四棱锥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/9257abca-364c-4f0e-99a8-cb7cc21ed349.png?resizew=284)
(1)证明:
;
(2)当二面角
在
内变化时,求直线
与平面
所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7527d873655c33ebcd1f2b14a9315c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/9257abca-364c-4f0e-99a8-cb7cc21ed349.png?resizew=284)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb50274e8907ba8ba624755c9f3462d3.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413057311afa5daa3815d4afd08dd3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5e354bb26ff35ea03241c4fdff96b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c87014fbb5c656a4f1892dbd88f242.png)
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