如图所示的几何体是图柱的一部分,它是由边长为2的正方形
(及其内部)以
边所在直线为旋转轴顺时针旋转
得到的.
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795287561142272/2798696840118272/STEM/4d4274d8-18a3-4cfb-bf5e-9375f2bd1a2f.png?resizew=214)
(1)求此几何体的体积;
(2)设
是弧
上的一点,且
.求二面角
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795287561142272/2798696840118272/STEM/4d4274d8-18a3-4cfb-bf5e-9375f2bd1a2f.png?resizew=214)
(1)求此几何体的体积;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01176f9a500f193ca8c60a2dc258589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b064e492a9b4041da16488d0c1984c0.png)
20-21高二下·上海金山·期末 查看更多[2]
更新时间:2021-09-01 13:06:12
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相似题推荐
解答题-问答题
|
适中
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解题方法
【推荐1】已知在直四棱柱
中,
,
是菱形且
,
,
分别为
,
的中点
(1)证明:
平面
;
(2)求三棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028856d5101687dd8eaf130846489cfd.png)
(2)求三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6663ce1b3963c7aff0bca163b20a486a.png)
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【推荐2】如图所示,某农户拟在院子的墙角处搭建一个谷仓,墙角可以看作如图所示的图形,其中OA、OB、
两两垂直(OA、OB、
均大于2米).该农户找了一块长、宽分别为2米和1米的矩形木板.将木板的一边紧贴地面,另外一组对边紧贴墙面,围出一个三棱柱(无盖)形的谷仓.
立方米,问:此时木板与两个墙面所成的锐二面角大小分别为多少?
(2)应怎样摆放木板,才能使得围成的谷仓容积最大?并求出该最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(2)应怎样摆放木板,才能使得围成的谷仓容积最大?并求出该最大值.
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解答题-证明题
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解题方法
【推荐1】如图,四棱锥
中,
平面
,梯形
满足
,
,且
,
,
为
中点,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953847428653056/2954988018180096/STEM/1281fa0d-e31c-4fc4-9d83-71ca57b4c376.png?resizew=192)
(1)求证:
,
,
,
四点共面;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafe41f8be1c2f76a83bdcb256a0b61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a41f49f951493ea98541676815dbc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6685ebfea4fe41b318f75e95047e8352.png)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953847428653056/2954988018180096/STEM/1281fa0d-e31c-4fc4-9d83-71ca57b4c376.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/895dc3dc3a6606ff487a4c4863e18509.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd02f171d6ae36135cd30987376e3b7.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面ABCD是边长为2的菱形,
,M为BC中点,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981295889465344/2986159075778560/STEM/7f08cba9-4acb-40e7-a45c-66e04ffdcb97.png?resizew=243)
(1)求证:平面
平面PMD;
(2)若平面
平面ABCD,三棱锥
的体积为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6560043276739bbd99cd5064b6182f1.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981295889465344/2986159075778560/STEM/7f08cba9-4acb-40e7-a45c-66e04ffdcb97.png?resizew=243)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5618714583a99a7d6277349314851e29.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c653b8894344786624fd44bfd636d6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
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