如图,在四棱锥P-ABCD中,PC⊥底面ABCD,AD∥BC,AD=2BC=2,PC=2,△ABC是以AC为斜边的等腰直角三角形,E是PD的中点.
![](https://img.xkw.com/dksih/QBM/2018/5/16/1946457470369792/1948578024030208/STEM/3d32a441b3294fab9a9c2dde78fdf58f.png?resizew=132)
(1)求证:平面EAC⊥平面PCD;
(2)求直线PA与平面EAC所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2018/5/16/1946457470369792/1948578024030208/STEM/3d32a441b3294fab9a9c2dde78fdf58f.png?resizew=132)
(1)求证:平面EAC⊥平面PCD;
(2)求直线PA与平面EAC所成角的正弦值.
更新时间:2018-05-19 10:55:02
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在矩形
中,
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把
折起到
位置,且
在面
内的射影
恰好落在
上.
![](https://img.xkw.com/dksih/QBM/2012/7/19/1570930607194112/1570930612371456/STEM/15ad6b0671d34e85ad84596c69180006.png?resizew=251)
(1)求证:
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)求证:
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(2)求
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解答题-证明题
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适中
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【推荐2】如图,在矩形
中,
,
是
的中点,沿直线
将
翻折成
,
.
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(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
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(1)求证:
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(2)求直线
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【推荐3】如图,四边形ABCD为正方形,
分别为
的中点,以DF为折痕把
折起,使点C到达点P的位置,且
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(1)证明:
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(2)求直线DP与平面ABFD所成角的正弦值.
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(1)证明:
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(2)求直线DP与平面ABFD所成角的正弦值.
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【推荐1】如图,AC是⊙O的直径,点B是⊙O上与A,C不重合的动点,
平面ABC,
.
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(1)当点B在什么位置时,平面
平面
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(2)当
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(1)当点B在什么位置时,平面
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(2)当
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解题方法
【推荐2】如图,在四棱锥
中,侧面
底面
,底面
是直角梯形,
.
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(1)证明:平面
平面
;
(2)在线段
上是否存在点M,使得直线
与平面
所成角的正弦值为
?若存在,求出线段
的长度;若不存在,请说明理由.
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/a9b6d211-dcd8-47f9-8d1d-ab69996a2a19.png?resizew=265)
(1)证明:平面
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(2)在线段
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