如图,在长方体
中,
,求直线
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/5ca8cbab2ee72946beceb799a711411d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb04914c4e8fb3483da44c67fe1809f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958749631250432/2962148965982208/STEM/bafb3a76-d950-4f1f-9aa3-366129d34052.png?resizew=212)
更新时间:2022-04-20 11:30:24
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,底面为菱形的四棱锥
中,
面
,
,
为
上一动点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/fbc31f96-f419-4f5e-a987-75b5cc19f458.png?resizew=141)
(1)求证:
;
(2)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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.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/587df01a98f499a9f361aafd8c3dac39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/fbc31f96-f419-4f5e-a987-75b5cc19f458.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84be64d28b1623e71ad989f37336b1f2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图1,已知矩形
中,
,点
是边
上的点,且
,
与
相交于点
.现将
沿
折起,如图2,点
的位置记为
,此时
.
![](https://img.xkw.com/dksih/QBM/2017/3/8/1639498089652224/1651492163067904/STEM/e9f8ce18-f143-4e02-93e1-403b2c03669c.png?resizew=374)
(Ⅰ)求证:
⊥平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57648ebc3ebb878c2a190d97cd02e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee827d0ad8309b0f03df963a63777b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d524b1a0d7b1e098ddd7de4433112c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defd4aaabe2aa643022fcbaedc0742ff.png)
![](https://img.xkw.com/dksih/QBM/2017/3/8/1639498089652224/1651492163067904/STEM/e9f8ce18-f143-4e02-93e1-403b2c03669c.png?resizew=374)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d818cb9f66874bf6bbc44569bb7d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc89fdd2210579467715f9388d53552.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在多面体
中,
均垂直于平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/b4882f1f-f0bd-48d7-be9d-70adf9ea7abc.png?resizew=161)
(1)证明:
平面
;
(2)求
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a93b9662f0ab8a69b131497520b53.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/721ca8391bdb38c10798e8c2601ce1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a654972e59387444a8a7bf7f1a93e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fa9cd864b937ee2a542495a8dc88e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/b4882f1f-f0bd-48d7-be9d-70adf9ea7abc.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c401f9dd333b36433b56d7aef1ffc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.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2】如图,在正四棱柱
中,底面
边长为1,侧棱
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963685459812352/2964935615856640/STEM/b1ec2bcc-d4c9-479b-9b00-42c300866c17.png?resizew=160)
(1)求直线
与平面
所成角的大小;(结果用反三角函数值表示)
(2)求直线
与平面
之间的距离.
![](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/92535536bd3c2761724fd058427f95a8.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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963685459812352/2964935615856640/STEM/b1ec2bcc-d4c9-479b-9b00-42c300866c17.png?resizew=160)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次