如图,在四棱锥
中,
,
,
,平面
平面
,E为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/d556e342-1a35-460c-a01d-5de164925a8d.png?resizew=154)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
面
;
(2)求证:
面
;
(3)点Q在棱
上,设
(
),若二面角
的余弦值为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70371cb0063e591d64fd18c4da417f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a53c63c98d49f37fe40ee7063f0b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/d556e342-1a35-460c-a01d-5de164925a8d.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)点Q在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249dc5045b2d6d1fc384e80293285df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4341c2c59f80fefd2e2ee1bd949c80cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
更新时间:2022-11-12 22:41:30
|
相似题推荐
解答题-问答题
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【推荐1】如图,
是三棱柱
的高,
,
,E是对角线
和
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/b847a268-b3e4-47b3-b56d-dff7c124284d.png?resizew=185)
(1)证明:
//平面
;
(2)若二面角
的正切为
,
,
,
, 求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2176a388502a0cfdb89b8457497de7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb177171853c4a9959c217cf9e8e62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee730f6a2551fb1b582ecf290cfea233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc65c549059934e69355d8ecc245da57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b362fffbd6e0fef50ca51fc300d23d74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/b847a268-b3e4-47b3-b56d-dff7c124284d.png?resizew=185)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab7f12f85c4f79214ab856d1e6d5c61.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4ba2f1a35b1d92df3bd58d09856374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103070abee09399f1e9510a75c3ba9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b711344e7d493b153b4f76ad648a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea8cab5ef6f4de786bb21ce87e05806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b5f8fbf71556718c5796c5a10cb47a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5b6dfff10cb3dc3e06509db56d7b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ac23a7643133134e5ec266c832600d.png)
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解题方法
【推荐2】如图,在四棱锥
中,平面
平面
,
平面
,
为锐角三角形,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/c6141ed5-84b4-46a7-853a-adae1937bea5.png?resizew=216)
(1)求证:
平面
;
(2)平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a698deee0d36c8d2772f39247f3f1b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0063f3f48e49f2970ec7f097567cef5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/c6141ed5-84b4-46a7-853a-adae1937bea5.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810ee7bc82b6f452afb3fc18691abc3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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【推荐1】如图,在平面四边形ABCD中,△ABC等边三角形,
,以AC为折痕将△ABC折起,使得平面
平面ACD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/65860a05-a0ab-4eed-b57e-5d39081d1fb9.png?resizew=339)
(1)设E为BC的中点,求证:
平面BCD.
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d676c6baf3d1b3696484f7dd372dd49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/65860a05-a0ab-4eed-b57e-5d39081d1fb9.png?resizew=339)
(1)设E为BC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2dce408452c26d04a1db60dcf7fb0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
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【推荐2】如图1,在正方形
中,
是
的中点,点
在线段
上,且
.若将
分别沿
折起,使
两点重合于点
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/4e331e3c-d72b-45ad-b19d-fcd205eb93d1.png?resizew=322)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678851c61127dd37d837d46fc982d6fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecb840b1f066fa370ac7f0533d06ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442f9cac51cc7ab4042fcc0ad7bcce51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/4e331e3c-d72b-45ad-b19d-fcd205eb93d1.png?resizew=322)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524eb6b7cb4c5736285af33101a78789.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13576338960eb920b0d69e91479d07dd.png)
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【推荐1】如图,在三棱锥
中,
是边长为4的正三角形,
的中点为D,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/db71cb56-61cf-4162-b1bc-d20cd12fb13d.png?resizew=173)
(1)求证:平面
平面
;
(2)若点P在底面上的射影为
的中点,且三棱锥
的体积为
,求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/db71cb56-61cf-4162-b1bc-d20cd12fb13d.png?resizew=173)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若点P在底面上的射影为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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【推荐2】在如图所示的空间几何体中,平面
平面
,
与
是边长为2的等边三角形,
,BE和平面ABC所成的角为
,M是AC中点,点E在平面ABC上的射影N落在直线BM上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/40e7d7a7-17f7-495e-b552-267b5552a0c0.png?resizew=178)
(1)求证:
平面ABC;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/40e7d7a7-17f7-495e-b552-267b5552a0c0.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f178906e90bafd73e0ef9f89814855d5.png)
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【推荐1】如图,在四棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/dbc335ac-b6dd-4b91-b8eb-139d3a6a3031.png?resizew=163)
(1)求证:
平面
.
(2)在线段
上是否存在一点H(与端点A,B不重合),使得二面角
的余弦值为
?若存在,请确定H点的位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675127116b1cace5e3158a88b7a2044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26010ed7c591360cfb958806869b55a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29470a095de205acb450d5a48b38be1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbde67cc84757b10bb66c47cee22de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/dbc335ac-b6dd-4b91-b8eb-139d3a6a3031.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99e9a45187e2f0e0d3e502e43f24d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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解题方法
【推荐2】如图,在四棱锥
中,平面
平面
,
,
,点
为
的中点.
(1)求平面
与平面
夹角的正弦值;
(2)在线段
上是否存在一点
,使直线
与平面
所成的角正弦值为
,若存在求出
的长,若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241b7945d6af3a7982e045d55365b89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24fb616cd741c239a3b98b3011b9bf66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/d18cc1a0-dfa8-4929-8d5b-8c2f8ae54fdf.png?resizew=160)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5574cb03120531bc3fe95db9a5802817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9fae202b6752ede68391086a2e56cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
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【推荐3】如图,在长方形
中,
,
,点
是
的中点.将
沿
折起,使平面
平面
,连结
、
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/653306d5-4df9-41f3-9a50-19fbf8595545.png?resizew=352)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/653306d5-4df9-41f3-9a50-19fbf8595545.png?resizew=352)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
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