如图,在四棱锥
中,
底面ABCD,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/8282d6bb-17f2-4d42-a68e-53430882cf9f.png?resizew=140)
(1)证明:平面
平面PAC;
(2)求AD与平面PCD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/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/8282d6bb-17f2-4d42-a68e-53430882cf9f.png?resizew=140)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
(2)求AD与平面PCD所成角的正弦值.
更新时间:2023-03-29 17:57:37
|
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解答题-证明题
|
适中
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名校
【推荐1】如图所示,在四棱锥
中,平面
平面
,底面
为正方形,侧面
为等腰三角形,且
,
的中点为
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709704434565120/2772076589654016/STEM/baa5c237-32a0-40a5-b105-5376756911c5.png?resizew=291)
(1)求证:
平面
;
(2)若点
为线段
上的动点,设直线
与平面
所成角的大小为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d755e3beaf392e1fd8dc4061c240228b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709704434565120/2772076589654016/STEM/baa5c237-32a0-40a5-b105-5376756911c5.png?resizew=291)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
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解答题-证明题
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【推荐2】如图四棱锥
中,
,
,E是SC的中点,O是底面正方形ABCD的中心,
.
![](https://img.xkw.com/dksih/QBM/2011/11/14/1570350349459456/1570350354866176/STEM/0cc7e31bf61f440f923355ad85cb72a6.png?resizew=184)
(1)求证:
平面SAD;
(2)求直线EO与平面SCD所成的角..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6933009c0119b0f380e303b5ef862d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114328e2c6128710608977e7927c7a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802bbf5c09dcda1805655955b99267c3.png)
![](https://img.xkw.com/dksih/QBM/2011/11/14/1570350349459456/1570350354866176/STEM/0cc7e31bf61f440f923355ad85cb72a6.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e614ff5cf2702e4761cb4539ce19f71e.png)
(2)求直线EO与平面SCD所成的角..
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解答题-证明题
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适中
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解题方法
【推荐1】如图,三棱锥
中,底面
是边长为2的正三角形,
,
底面
,点
分别为
,
的中点.
(1)求证:平面
平面
;
(2)在线段
上是否存在点
,使得直线
与平面
所成的角的余弦值为
?若存在,确定点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/c5bf670f-c6c7-441d-b3fd-86d840bbcb44.png?resizew=148)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在三棱锥
中,
,O为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f81a96a5-214d-430d-aa62-8b57877299c4.png?resizew=151)
(1)证明:平面
平面
;
(2)若点M在棱
上,
,且
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30aee705f8da32a65fbea3925b054a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f81a96a5-214d-430d-aa62-8b57877299c4.png?resizew=151)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8f3dd6c6f43d594d10735338e6a2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若点M在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65bb0407b1f1d74d6696be742d0aa05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c745df4f226027778d5fe45b6501b822.png)
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