如图所示,四棱锥
的底面
是矩形,
底面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/932dca6d-60d5-4a7f-95c2-6bb684b94f2e.png?resizew=160)
(1)证明:平面
平面
;
(2)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/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638d9cccb679214718224c3088ed4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b279505327550bbb8077940fd44f01c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd358d23ced19c951ba670188ceaf15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/932dca6d-60d5-4a7f-95c2-6bb684b94f2e.png?resizew=160)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cfcf3b8cd4f355003350a9d45a1619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
更新时间:2023-01-13 18:48:51
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在长方体
中,
.
是线段
上的点.
![](https://img.xkw.com/dksih/QBM/2023/10/23/3352312603574272/3352785188331520/STEM/804af53d6dd848c7a71c43e3a3d37912.png?resizew=212)
(1)若
,求证:
平面
.
(2)若
,在线段
上是否存在点
.使
,若存在.求
的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6155f82a6f64b20085976cea9b64193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/2023/10/23/3352312603574272/3352785188331520/STEM/804af53d6dd848c7a71c43e3a3d37912.png?resizew=212)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8940bc785b291b24e323a6600b5bf96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd78a9c778b34662d33df749b1c0051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355e49d9c1af1db6e040d5c0ea54bc4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d448be0954d79181a703e7e02b667fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
【推荐2】如图,圆锥的顶点为
,
为底面圆
的直径,
是圆
上一点,
是
的中点,
,
为底面圆周上异于点
的一个动点.
,使得
平面
?若存在,确定点
的位置;若不存在,请说明理由;
(2)记直线
与平面
所成角的最大值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6c37511cda3523d69ab3c0f81478c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9abe6e8d1f4f1e8bdc46ddbae0cd789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)记直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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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】如图四棱锥P﹣ABCD中,底面ABCD是平行四边形,PG⊥平面ABCD,垂足为G,G在AD上且AG=
GD,BG⊥GC,GB=GC=2,E是BC的中点,四面体P﹣BCG的体积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/182fe15d-853b-4ffe-87eb-f1c5bce6a26d.png?resizew=239)
(1)求过点P,C,B,G四点的球的表面积;
(2)求直线DP与平面PBG所成角的正弦值;
(3)在棱PC上是否存在一点F,使DF⊥GC,若存在,确定点F的位置,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/182fe15d-853b-4ffe-87eb-f1c5bce6a26d.png?resizew=239)
(1)求过点P,C,B,G四点的球的表面积;
(2)求直线DP与平面PBG所成角的正弦值;
(3)在棱PC上是否存在一点F,使DF⊥GC,若存在,确定点F的位置,若不存在,说明理由.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
平面ABCD,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979799753777152/2981498326990848/STEM/93927712-6303-4e51-921f-1175ee21f99a.png?resizew=178)
(1)求证:
;
(2)求直线BE与平面CDE所成角的正弦值;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883200c4d4e82a5411064a644aabfe33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dac2c17c765517c2163ab43bbe1038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://img.xkw.com/dksih/QBM/2022/5/15/2979799753777152/2981498326990848/STEM/93927712-6303-4e51-921f-1175ee21f99a.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1346a2096399c6e01cce60d0c49af9ca.png)
(2)求直线BE与平面CDE所成角的正弦值;
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147310251a463539f66374c1f452fb67.png)
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解答题-问答题
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适中
(0.65)
【推荐3】如图,在四棱锥
中,已知
,
,
,
,
,
,
为
上的动点.
![](https://img.xkw.com/dksih/QBM/2021/3/24/2684825315008512/2684883951198208/STEM/40e6aa7c-9c38-4cd7-8880-39898ce1c513.png?resizew=238)
(1)探究:当
为何值时,
平面
?
(2)在(1)的条件下,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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c313dff515240bc75d42f6687ac44cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967f74b8993c61634ceed95edca05ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7dcba0c73b994832543511e2a1681ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd0d45d68882ab2ed807ae2f199bac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2021/3/24/2684825315008512/2684883951198208/STEM/40e6aa7c-9c38-4cd7-8880-39898ce1c513.png?resizew=238)
(1)探究:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1122194658d429a4c187d6fe4a1c6239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)在(1)的条件下,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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