如图,在四棱锥
中,底面
是菱形,侧面
底面
,且PA=AB,
.
![](https://img.xkw.com/dksih/QBM/2021/9/1/2803811396755456/2845255953113088/STEM/01845e3d711647d8ac4e11d0b5de8c72.png?resizew=236)
(1)证明:
;
(2)若
,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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f17680a23635f823b7dc446e4f3b0a.png)
![](https://img.xkw.com/dksih/QBM/2021/9/1/2803811396755456/2845255953113088/STEM/01845e3d711647d8ac4e11d0b5de8c72.png?resizew=236)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
2022·浙江·模拟预测 查看更多[2]
更新时间:2021-11-06 07:50:57
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,四棱台
的底面是矩形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/330172c3-fed6-4ee4-9556-efc2ee288b50.png?resizew=171)
(1)证明:
平面
;
(2)设平面
与平面
的交线为
,求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0247cb8022f81d0897142a537ddbea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e9effc506d0373565c4394a6cf4e7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/330172c3-fed6-4ee4-9556-efc2ee288b50.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbe5de909b009cd31d076b19faa579f.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5c7bf9276315761b0b5517e2472e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a39cf1a9eedda28c63f13ea478ec6b.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/67ee01e28681b584f85c8875f053b77b.png)
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解题方法
【推荐2】如图,三棱锥
中,平面
平面
,
,
分别是
,
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899244988276736/2903019912511488/STEM/78f9cca2-26b1-4d22-a285-fc6a880671a1.png?resizew=222)
(1)在线段
上是否存在点
,使得
平面
,若存在,求出
的值;若不存在,请说明理由;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0345bba2fd9d383d836b7591aacc44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899244988276736/2903019912511488/STEM/78f9cca2-26b1-4d22-a285-fc6a880671a1.png?resizew=222)
(1)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f44f2b2f82a9126223138972850aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d666dd3308604685e59f4ca22663b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a375f0489b083f97c95f1dd4e4de455.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
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【推荐3】在棱长为2的正方体
中,E、F分别是BC、CD的中点.
(1)求证:
;
(2)求直线
与平面
所成角的大小;
(3)若点G、H分别为线段
上的动点,点P为底面
上的动点,求GH+GP的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a406812f60087b799d16ebd5c1259e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a6a7bf19f1bb49ab5a90bb236a7318.png)
(3)若点G、H分别为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2258f0c4c1535f0ee3ab3cd87619ae5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
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【推荐1】如图①,在平面多边形ABCDE中,
,
为等腰直角三角形,四边形ABCD为等腰梯形,且
,沿AD将
折起,使得
,M为BC的中点,连接AM,BD,如图②.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0e646831-934c-44b8-a6d4-a844e88e8916.png?resizew=414)
(1)证明:
;
(2)求直线DE与平面BEM所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7624907b562e102da1fdbb10bc43895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783a833992e0862211a15fec2d3e3dda.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0e646831-934c-44b8-a6d4-a844e88e8916.png?resizew=414)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e309053297619d3b46fcec970b68509.png)
(2)求直线DE与平面BEM所成角的正弦值.
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【推荐2】如图,在三棱柱
中,
平面
,
,
,
为
的中点,
交
于点
.
(1)证明:
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e6d7d1f211b8a7b6e0223641430a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/90c4bd1e-01bd-4197-bfb8-448cfdf2665c.png?resizew=138)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73616ee0a39a5c84c6635b3840880b5.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecad355286188fd317939fa50f9555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
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