如图所示,
是边长为2的等边三角形,
平面
,
是
的中点.
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f6e3552eddd977fc8560d5316769a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/0bc9a75e-661b-4bdc-9246-296b32504a17.png?resizew=107)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
22-23高一下·新疆喀什·期中 查看更多[2]
新疆维吾尔自治区喀什第二中学2022-2023学年高一下学期期中考试数学试题(已下线)专题06 二面角4种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教B版2019选择性必修第一册)
更新时间:2023-07-12 16:22:50
|
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解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】如图,在等腰直角
中,
,D为
中点,E,F分别为
,
中点.现将
绕边
翻折至
,使面
面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/9a784e43-853f-40c3-8cbf-fcb9f7d591e5.png?resizew=285)
(1)证明:
平面
;
(2)若Q是线段
上的动点,求当
与
所成角取得最小值时,线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/9a784e43-853f-40c3-8cbf-fcb9f7d591e5.png?resizew=285)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若Q是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
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【推荐2】如图,直四棱柱
中,
,
,点
,
分别
,
中点.
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447896990384128/2448267605753856/STEM/bb42938b9b414a9cb0be2ac2b223293b.png?resizew=121)
(1)证明:
∥平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/247766d2e4a6a530d5d5dd308d0537c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecd9d84ed92c084753641636dff091f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447896990384128/2448267605753856/STEM/bb42938b9b414a9cb0be2ac2b223293b.png?resizew=121)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee68a9b2e53ef2503eb189495645111.png)
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解答题-证明题
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名校
【推荐1】如图①,在等腰
中,点
是底边
的中点,将
沿
折至
的位置.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/fbb6fb18-33ee-48dd-ac7f-7d0deff57135.png?resizew=174)
(1)求证:
平面
.
(2)若三棱锥
的三视图为图②所示的三个直角三角形,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e195f36d43128197ea62c7f53ed57197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fded87a08e621a0aa62659e26232f85c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/fbb6fb18-33ee-48dd-ac7f-7d0deff57135.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739c629772c553e9a2329d5d71173736.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c9a742c1e218d1fcdb92bce78123e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3bceb0faeccb4766590b1da63f38a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/b3175e44-7823-4a0c-adc1-8d2d163e5261.png?resizew=289)
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解答题-问答题
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较易
(0.85)
解题方法
【推荐2】如图,正方体
的棱长为2,求:
![](https://img.xkw.com/dksih/QBM/2021/8/25/2793846320898048/2795438938963968/STEM/4291d2aa-490c-46b0-8b07-7c35c8c0584a.png?resizew=267)
(1)二面角
的大小.
(2)求三棱锥
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2021/8/25/2793846320898048/2795438938963968/STEM/4291d2aa-490c-46b0-8b07-7c35c8c0584a.png?resizew=267)
(1)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76ac94a6fe283f28f812d3cd0ed13ab.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ebd86a076448d19401268f139b5b90.png)
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