解题方法
1 . 如图,图1,四棱锥
中,
底面
,面
是直角梯形,M为侧棱
上一点.该四棱锥的俯视图和侧(左)视图如图2所示.
(1)证明:
平面
;
(2)证明:
平面
;
(3)线段
上是否存在点N,使
与
所成角的余弦值为
?若存在,找到所有符合要求的点N,并求
的长;若不存在,说明理由.
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/5d6f2ac4-e07b-46f9-8a63-5cce096fa961.png?resizew=410)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
您最近一年使用:0次
解题方法
2 . 如图所示的三个图中,上面的是一个长方体截去一个角所得多面体的直观图,它的正视图和侧视图在下面画出(单位:
)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644412494487552/2645966217216000/STEM/9ff942c10d2f41efb82eebf38c2e5384.png?resizew=224)
(1)按照给出的尺寸,求该多面体的体积;
(2)在所给直观图中连接
,证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644412494487552/2645966217216000/STEM/9ff942c10d2f41efb82eebf38c2e5384.png?resizew=224)
(1)按照给出的尺寸,求该多面体的体积;
(2)在所给直观图中连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b48596fab810f292e000dfa6284cca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
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2021-01-28更新
|
105次组卷
|
2卷引用:安徽省安庆市怀宁县第二中学2020-2021学年高三上学期第五次月考数学(文)试题
解题方法
3 . 所有顶点都在两个平行平面内的多面体叫拟柱体,它在这两个平面内的面叫拟柱体的底面,两底面之间的距离叫拟柱体的高,可以证明:设拟柱体的上、下底面和中截面(与底面平行且与两底面等距离的平面截几何体所得的截面)的面积分别为
,
,
,高为h,则拟柱体的体积为
.若某拟柱体的三视图如图所示,则其体积为______________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/150a135bbd528daf3f19a58a621a57c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f562eb3c2a45d65cba066d712825a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d04e4e69e9767ebd9f9920f7a97e4e9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/e36901cc-9e35-437c-bbe6-9dc82aff272d.png?resizew=138)
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4 . 已知四棱锥
的直观图如图所示,其中
,
,
两两垂直,
,且底面
为平行四边形.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378483504398336/2378857983524864/STEM/237b36ce72af4782ae9239c9e2a1d8e8.png?resizew=293)
(1)证明:
.
(2)如图,网格纸上小正方形的边长为1,粗线画出的是该四棱锥的正视图与俯视图,请在网格纸上用粗线画出该四棱锥的侧视图,并求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2e356de1dec9ce998366a1a35c0a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378483504398336/2378857983524864/STEM/237b36ce72af4782ae9239c9e2a1d8e8.png?resizew=293)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)如图,网格纸上小正方形的边长为1,粗线画出的是该四棱锥的正视图与俯视图,请在网格纸上用粗线画出该四棱锥的侧视图,并求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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2020-01-17更新
|
213次组卷
|
9卷引用:辽宁省葫芦岛协作校2019-2020学年高三上学期第二次考试 数学(文) 试题
辽宁省葫芦岛协作校2019-2020学年高三上学期第二次考试 数学(文) 试题辽宁省葫芦岛协作校2019-2020学年高三上学期第二次考试 数学(理)试题湖南省衡阳市衡阳县、长宁、金山区2019-2020学年高三上学期12月联考数学(文)试题湖南省衡阳市衡阳县、长宁、金山区2019-2020学年高三上学期12月联考数学(理)试题(已下线)2020届高三12月第01期(考点07)(文科)-《新题速递·数学》2020届湖南省百所重点高中高三12月大联考数学文科试题2020届湖南省百所重点高中高三12月大联考数学理科试题山西省2019-2020学年高二上学期期中数学(文)试题山西省2019-2020学年高二上学期期中考试数学(理)试题
名校
5 . 四面体
及其三视图如图所示,平行于棱
,
的平面分别交四面体的棱
,
,
,
于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/bb359534-3808-45e1-a9eb-9ef1a8c00013.png?resizew=375)
(1) 求四面体
的体积;
(2)证明:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/bb359534-3808-45e1-a9eb-9ef1a8c00013.png?resizew=375)
(1) 求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
2019-12-28更新
|
125次组卷
|
7卷引用:专题23 立体几何解答题(文科)-1
6 . 如图,在四棱柱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740549ec3a3a6af4cbf5c34198516f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9e28fe522ee7f03a6c24e3803984b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/b11ab33a-a6be-465e-9307-d31923249dc6.png?resizew=134)
(1)当正视方向与向量
的方向相同时,画出四棱锥
的正视图(要求标出尺寸,并写出演算过程);
(2)若M为PA的中点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb22cc85336ed6e36ff0d964562a9038.png)
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/740549ec3a3a6af4cbf5c34198516f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9e28fe522ee7f03a6c24e3803984b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/b11ab33a-a6be-465e-9307-d31923249dc6.png?resizew=134)
(1)当正视方向与向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d036188ce294e3c7427d0b7d2294fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(2)若M为PA的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb22cc85336ed6e36ff0d964562a9038.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f2d2ef6661d1808fed0cbd1b0fa53d.png)
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2011·广东广州·一模
7 . 一个几何体是由圆柱
和三棱锥
组合而成,点
、
、
在圆
的圆周上,其正(主)视图、侧(左)视图的面积分别为10和12,如图3所示,其中
平面
,
,
,
.
(1)求证:
;
(2)求二面角
的平面角的大小.
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/71b3d38a0dc34dffa1fab1b2ef2bbde3.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/27111b366e8541f4a0b884b11136e6ef.png?resizew=498)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f00a2efdc6171e9455c402f62e9d737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/71b3d38a0dc34dffa1fab1b2ef2bbde3.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/27111b366e8541f4a0b884b11136e6ef.png?resizew=498)
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8 . 如图,多面体ABCD﹣EFG中,底面ABCD为正方形,GD∥FC∥AE,AE⊥平面ABCD,其正视图、俯视图如下:
(I)求证:平面AEF⊥平面BDG;
(II)若存在λ>0使得
,二面角A﹣BG﹣K的大小为60°,求λ的值.
(I)求证:平面AEF⊥平面BDG;
(II)若存在λ>0使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6987bfcb8ad393226a90892ea3261e0a.png)
![](https://img.xkw.com/dksih/QBM/2011/4/11/1570115433324544/1570115438198784/STEM/cac5e02b9130464ea7ac56f57361002f.png?resizew=227)
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2011·黑龙江·三模
解题方法
9 . 如图是一几何体的直观图、主视图、俯视图、左视图.
(1)若F为PD的中点,求证:AF⊥面PCD;
(2)求面PEC与面PCD所成的二面角(锐角)的余弦值.
(1)若F为PD的中点,求证:AF⊥面PCD;
(2)求面PEC与面PCD所成的二面角(锐角)的余弦值.
![](https://img.xkw.com/dksih/QBM/2011/5/24/1570222129602560/1570222134591488/STEM/ed1e809de3dc44139a03085637840927.png?resizew=266)
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10 . 下面的一组图形为某一四棱锥S-ABCD的侧面与底面.
![](https://img.xkw.com/dksih/QBM/2011/8/4/1570279325794304/1570279330979840/STEM/b1620fee0d604deea931e20ea63cbc97.png?resizew=456)
(1)请画出四棱锥S-ABCD的直观图,是否存在一条侧棱垂直于底面?如果存在,请给出证明;如果不存在,请说明理由;
(2)若SA
面ABCD,E为AB中点,求二面角E-SC-D的大小;
(3)求点D到面SEC的距离.
![](https://img.xkw.com/dksih/QBM/2011/8/4/1570279325794304/1570279330979840/STEM/b1620fee0d604deea931e20ea63cbc97.png?resizew=456)
(1)请画出四棱锥S-ABCD的直观图,是否存在一条侧棱垂直于底面?如果存在,请给出证明;如果不存在,请说明理由;
(2)若SA
![](https://img.xkw.com/dksih/QBM/2011/8/4/1570279325794304/1570279330979840/STEM/426b3633a0364472b4e355bb0c46e027.png?resizew=16)
(3)求点D到面SEC的距离.
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