如图,平面ABCD是圆柱OO₁的轴截面,EF是圆柱的母线,AF∩DE=G,BF∩CE=H,∠ABE=60°,AB=AD=2.
(1)求证:GH∥平面ABCD;
(2)求平面ABF与平面CDE夹角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/0b7ab3f3-679d-40be-ab6e-fea74d8eb551.png?resizew=144)
(1)求证:GH∥平面ABCD;
(2)求平面ABF与平面CDE夹角的正弦值.
更新时间:2023-06-03 10:05:18
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,
,
,
,
,
平面
,点
是棱
上一点,且
平面
,三棱锥
的体积为
.
到平面
的距离;
(2)求二面角
的余弦值.
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(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9c7940d6f1ede201fd27d5d9e0650d.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,四棱锥
中,
底面
,
,
,
为
的中点,点
在
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331fc9dfec38ba69ba909e636abc6bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/51480fe6-9f8b-4315-841c-7a1aba92b7f1.png?resizew=200)
(1)求证:
平面
;
(2)求点
到平面
的距离.
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/51480fe6-9f8b-4315-841c-7a1aba92b7f1.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
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(2)求点
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解答题-问答题
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适中
(0.65)
【推荐1】如图1,矩形
中,
,
,
为
上一点且
.现将
沿着
折起,使得
,得到的图形如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/f661c132-909f-4d57-b032-c0af8fcec1ce.png?resizew=401)
(1)证明:
平面
;
(2)求二面角
的余弦值.
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(1)证明:
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(2)求二面角
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
,
,
分别是棱
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(1)当
时,求证:
;
(2)已知
为
中点时,线段
上是否存在点
,使得平面
与平面
夹角的余弦值为
,若存在,请确定点
的位置,若不存在,请说明理由.
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(1)当
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(2)已知
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您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐3】如图,在三棱锥
中,侧面
为等边三角形,
,
,平面
平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/e322575f-3d2f-4591-a6ca-5f81628345f4.png?resizew=150)
(1)求证:
;
(2)若
,求二面角
的大小.
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(1)求证:
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec6246613bb4c4b2ef93770e427e8eb.png)
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