如图,
是圆
的直径,点
是圆
上异于
、
的点,直线
平面
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/07190a54-be05-4c07-a235-910da862c4af.png?resizew=173)
(1)记平面
与平面
的交线为
,试判断
与平面
的位置关系,并加以说明;
(2)设(1)中的直线
与圆
的另一个交点为
,且点
满足
,记直线
与平面
所成的角为
,异面直线
与
所成的锐角为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/07190a54-be05-4c07-a235-910da862c4af.png?resizew=173)
(1)记平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)设(1)中的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9bac0be49e5d58dde3dbb08276388c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e8b10d5974cc5b1ec84ca73b42f6ed.png)
更新时间:2023-02-28 22:46:14
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,三棱柱
中,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/db42e18e-16d2-4c57-b262-dd8f2ef0d16b.png?resizew=194)
(1)证明:直线
平面
;
(2)
,
,
,
,求平面
和平面
所成的角(锐角)的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/db42e18e-16d2-4c57-b262-dd8f2ef0d16b.png?resizew=194)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb3edb9e444eb488f867bb22e57ab58.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f52d26789b16e3da3b669f6ef91bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4d8707d92f4abfcd6065b59542f7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a909d59728483521a7ad892babd388a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39911e66af363baa6c0c5687532fd594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55be3879f038e8bf3aec892c7a0e89ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00341a133252e9a5665f292435745946.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图所示,在四棱锥
中,平面
底面
,
,
,
,
,
,
.设平面
与平面
的交线为
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/8650d0ac-a3df-45db-a564-aafe91ef10a9.png?resizew=160)
(1)求证:
平面
;
(2)若在棱
上存在一点
,使得
平面
,当四棱锥
的体积最大时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59567dbf014b5608475254efb2cf2c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1804c3641953c30ccf750504eff6577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/8650d0ac-a3df-45db-a564-aafe91ef10a9.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a4afe69e9ee3c701f1f109c3a0a7d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)若在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c982eb645d77aa24c642fca6d72e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7393358bb94b0df78fd4e29223257e1.png)
您最近一年使用:0次
解答题-证明题
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适中
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【推荐1】如图,在多面体ABCDE中,
,
,
,
![](https://img.xkw.com/dksih/QBM/2021/4/30/2710959732654080/2802841208520704/STEM/d59693a1-eb63-41a5-b77e-51af0497dd6b.png?resizew=275)
(1)
,且
,点M为EC的中点,求证:
平面BCD;
(2)若
是边长为2的等边三角形,
,N在线段CD上,且
,求BN与平面ACD所成角的大小;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525cef76ab5396af0846205d665388bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://img.xkw.com/dksih/QBM/2021/4/30/2710959732654080/2802841208520704/STEM/d59693a1-eb63-41a5-b77e-51af0497dd6b.png?resizew=275)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e20b970f3b0dc1c9a3de6eb09beead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28be1dbdf1c4df932252fe0029715f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263b3b463abe177060cc66b725aa0293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7200c1e9b672cd8a3c72293eece76aa.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在三棱锥
中,
为等腰直角三角形,点
,
分别是线段
,
的中点,点
在线段
上,且
.若
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/461fd1d2-e31d-4a6d-9d2b-4342daf99ead.png?resizew=205)
(Ⅰ)求证:
平面
;
(Ⅱ)求直线
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f68352679b462b0e29a9a0f6254793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf849fea9f0311b67fddc491a7f57a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/461fd1d2-e31d-4a6d-9d2b-4342daf99ead.png?resizew=205)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2fef2c0e49ecae8688ca60802310e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
解题方法
【推荐1】在棱长为a的正方体
中,E、F分别是棱
上的动点,且
.
(1)求证:
;
(2)当三棱锥
的体积取得最大值时,求二面角
的大小.(结果用反三角函数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94fd432df8731b054aa87095b802ab4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c6898dcd2374de8bed162d63903fa2.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8b850284b71991c6987975c346c837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c569ce16c38e5a6e0e02a25077f91c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图所示,已知三棱锥
,D为
的中点,且
是正三角形,
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709763705954304/2808664621621248/STEM/b330176d-c1fd-43e9-8ed9-5453558a3d4c.png?resizew=276)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2ea5a2c4ec45f70ec28a1453a10411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bb4ef08f6070a6bbc54ea9c4f130d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709763705954304/2808664621621248/STEM/b330176d-c1fd-43e9-8ed9-5453558a3d4c.png?resizew=276)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ea6e7aec788b4a60aeabdb948a95c6.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐3】已知边长为3的正方体
(如图),现用一个平面
截该正方体,平面
与棱
、
、
分别交于点
、
、
.若
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/9ff3b335-cee1-455b-a07f-8e7637ecb8c9.jpg?resizew=195)
(1)求面
与面
所成锐二面角的余弦值;
(2)请在答题卷的第2个图中作出截面
与正方体各面的交线,用字母标识出交线与棱的交点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1586681cc763024b659b07dc4ccd02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f31a3724c639f88486f8356ca65397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0add97c20dbfc86bcfa651b21356fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/9ff3b335-cee1-455b-a07f-8e7637ecb8c9.jpg?resizew=195)
(1)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)请在答题卷的第2个图中作出截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,正三棱柱
中,E,F分别是棱
,
上的点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
平面
,且M是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/901e5fec-c720-4e26-9d3f-ca35bf161bc3.jpg?resizew=148)
(1)证明:平面
平面
;
(2)若
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/901e5fec-c720-4e26-9d3f-ca35bf161bc3.jpg?resizew=148)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d557872d3299577be8c5872ba1ae5b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f5b538bcfb898fcc9d3a2dd8a1b080.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2】如图,在四棱锥
中,底面
为菱形,
,
,
,
平面
,点M,N,H分别在棱PB,PD,PC上,且
.
;
(2)连接AC交BD于点O,连接OP.求证:
平面
;
(3)若H为PC的中点,PA与平面
所成角为60°,四棱锥
被平面
截为两部分,记四棱锥
体积为
,另一部分体积为
,求
.
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828247a3338571cb0d4ba2a5bf88929c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec6297cf195e60fd53375a501deb2ac.png)
(2)连接AC交BD于点O,连接OP.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc6f007dbf1c1a36eb031e520608403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若H为PC的中点,PA与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bb075576cc0f585bda44277ac1d098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】四棱锥
的底面
是边长为2的菱形,
平面
,过点
且与
平行的平面
与
分别交于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/25eba1c4-0c03-4ba9-8bbb-12ea310cf0e2.png?resizew=171)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364161cf7180f8cc8da95f79019acfa2.png)
(2)
为
中点,且
与平面
所成的角为
,求二面角
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9cc564e059cfef1d368f32c494fd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd5e413cb380bfad5af472412236775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/25eba1c4-0c03-4ba9-8bbb-12ea310cf0e2.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364161cf7180f8cc8da95f79019acfa2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432b602bbaf82a4a40091ecfc8a8ffb0.png)
您最近一年使用:0次