如图,在三棱柱
中,底面
是边长为2的正三角形,侧面
是菱形,平面
平面
,
,
分别是棱
,
的中点,
是棱
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961308301631488/2963616140009472/STEM/d5b7d634-b7f1-4a72-a88b-27cd41d15368.png?resizew=230)
(1)证明:
平面
;
(2)从①三棱锥
的体积为1;②
与底面
所成的角为60°;③异面直线
与
所成的角为30°这三个条件中选择-一个作为已知,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45963da68f1b237d5275e506f071eff.png)
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961308301631488/2963616140009472/STEM/d5b7d634-b7f1-4a72-a88b-27cd41d15368.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)从①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861d61d2b7b16e12fd97f870fb3fa522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aae4c7c4bdc8eb84c1cd3a8c5a40701.png)
21-22高二下·江苏南京·期中 查看更多[6]
江苏省南京师范大学附属中学2021-2022学年高二下学期期中数学试题四川省成都市树德中学2022届高三下学期高考适应性考试数学(理科)试题空间向量与立体几何中的高考新题型辽宁省本溪市本溪县高级中学2022-2023学年高二上学期第一次月考数学试题(已下线)北京市海淀区2023届高三上学期期末练习数学试题变式题16-21(已下线)专题4 大题分类练(空间向量与立体几何)拔高能力练 高二期末
更新时间:2022-04-22 13:15:22
|
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解答题-证明题
|
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【推荐1】如图,三角形ABC是圆柱底面圆的内接三角形,PA为圆柱的母线,M,N分别是AC和PA的中点,平面
平面PAB,
.
(1)求证:
;
(2)求三棱锥
和圆柱的体积之比;
(3)求平面PBC与平面MBN所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81981fd7b343f4fe2db8f36eb66c1ce7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/c80a5f16-d351-4e09-8651-19466437aedf.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee290ca75608e596792246a80fb02e37.png)
(3)求平面PBC与平面MBN所成的锐二面角的大小.
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解题方法
【推荐2】从一张半径为3的圆形铁皮中裁剪出一块扇形铁皮(如图1阴影部分),并卷成一个深度为
米的圆锥筒(如图2).若所裁剪的扇形铁皮的圆心角为
.
(2)在(1)中的圆锥内有一个底面圆半径为
的内接圆柱(如图3),求内接圆柱侧面积的最大值以及取最大值时
的取值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dba0abded5bd1fdaadbe0086e79007.png)
(2)在(1)中的圆锥内有一个底面圆半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】如图,四棱锥
中,四边形ABCD为梯形,
,
,
,
,
,M,N分别是PD,PB的中点.
![](https://img.xkw.com/dksih/QBM/2023/8/9/3299393312997376/3301144638644224/STEM/6ad4cda41de54f9783522fc1ff257e58.png?resizew=142)
(1)求证:直线
平面ABCD;
(2)求平面MCN与平面ABCD夹角的余弦值.
![](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/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7199d1d025cf4bb7ad943b0f2d48000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1806bb5466e7279fd46f602ab1b473f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ff26d9121c651ed648f0eafe293fd6.png)
![](https://img.xkw.com/dksih/QBM/2023/8/9/3299393312997376/3301144638644224/STEM/6ad4cda41de54f9783522fc1ff257e58.png?resizew=142)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
(2)求平面MCN与平面ABCD夹角的余弦值.
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解题方法
【推荐2】如图,在四棱锥
中,
是等边三角形,
平面
,
且
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938939454816256/2943958259965952/STEM/bd565328d8aa428caa204df5bb171bb2.png?resizew=227)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0787d2cb66d00c49d3348b52acd407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206cc20c5da920b954e67b3775733685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938939454816256/2943958259965952/STEM/bd565328d8aa428caa204df5bb171bb2.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f687c40c3b65923237e3a96ea593e65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d62d30d732c3c6ee3f0dd66d7059356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
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【推荐1】如图,四棱锥
中,底面
为矩形,
平面
,E为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/6/5/2742734581170176/2792348081422336/STEM/b86c5735-fde9-4a37-b359-30a3f3d82ea2.png?resizew=270)
(1)证明:
平面
;
(2)设
,
,
,求二面角
的大小.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2021/6/5/2742734581170176/2792348081422336/STEM/b86c5735-fde9-4a37-b359-30a3f3d82ea2.png?resizew=270)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98823cbc09ca52df1fbcc446eba3e44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe88fb8bc8fe985cf2bb29003cc9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbeab80976db9b4689b9446cda06196a.png)
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【推荐2】在四棱锥
中,四边形
是矩形,
是正三角形,且平面
平面
,
,P为棱
的中点,E为棱
的中点.
(1)求证:
平面
;
(2)若
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5830322dd2824ed012a68f1a2bd9c742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/a8244d7f-0e2d-4b85-bb8f-63a441d2bead.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e4efb8e1bf4b3a121d4eb0eacf4d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3225b076c6b246af5b4bbe236524eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b81fb655624ff75a5eab94de9b8c8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
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【推荐1】如图所示,在几何体EFG-DABC中,四边形ABCD,CDGF,ADGE均为正方形,且边长均为1,点M在棱DG上.
![](https://img.xkw.com/dksih/QBM/2022/8/11/3042091438981120/3042451042631680/STEM/fc28f8ecc4a248ed86c2420ec8f7b4d6.png?resizew=183)
(1)求证:BM
EF.
(2)当DM的长为多少时,使得直线MB与平面BEF所成的角为45
?
![](https://img.xkw.com/dksih/QBM/2022/8/11/3042091438981120/3042451042631680/STEM/fc28f8ecc4a248ed86c2420ec8f7b4d6.png?resizew=183)
(1)求证:BM
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)当DM的长为多少时,使得直线MB与平面BEF所成的角为45
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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【推荐2】如图,四棱锥S—ABCD中,底面ABCD为菱形,
,侧面SAB⊥侧面SBC,M为AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/3fdc73d9-b024-448b-9a60-36007ce46a17.png?resizew=242)
(1)求证:平面SMC⊥平面SBC;
(2)若AB与平面SBC成
角时,求二面角
的大小,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e802c1023c684f286ecfb38f1e47b0f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/3fdc73d9-b024-448b-9a60-36007ce46a17.png?resizew=242)
(1)求证:平面SMC⊥平面SBC;
(2)若AB与平面SBC成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d72f17779a02f405a5c534030728d03.png)
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