如图,在半圆柱
中,
分别为两底面半圆的圆心,平面
是半圆柱的轴截面,
、
分别是两底面半圆弧的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/9f7061ce-ee19-447f-ae87-4569d64b6f3e.png?resizew=311)
(1)求证:平面
平面
;
(2)求半圆柱的体积与四棱锥
的体积的比值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d096cd7bd8a5a2219fd7dd166bbb8460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/9f7061ce-ee19-447f-ae87-4569d64b6f3e.png?resizew=311)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9d78d523614109d391aaa899261806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14c40eef3409fe3f1402639427a64b8.png)
(2)求半圆柱的体积与四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
更新时间:2020-04-06 23:28:28
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相似题推荐
解答题-证明题
|
适中
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名校
解题方法
【推荐1】如图,在直三棱柱
中,
是
的中点.
(1)求证:
平面
;
(2)若
,
,
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778ddb5cd565f3e96697aee202b9d510.png)
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【推荐2】某礼品店要制作一批长方体包装盒,材料是边长为
的正方形纸板,如图所示,先在正方形的相邻两个角各切去一个边长为
的正方形,然后在余下两角处各切去一个长、宽分别为
、
的矩形,再将剩余部分沿图中的虚线折起,做成一个有盖的长方体包装盒.
(2)当x为多少时,包装盒的容积最大?最大容积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4808677c177885e653933ab00a00574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d0abc998ec2b780be50b061c3de05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e83bdd7c312d9a7d5a81aa5e9ecf2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d0abc998ec2b780be50b061c3de05c.png)
(2)当x为多少时,包装盒的容积最大?最大容积是多少?
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解答题-作图题
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【推荐1】已知某几何体的正视图、侧视图都是直角三角形,俯视图是矩形(尺寸如图所示).
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570118836822016/1570118841769984/STEM/0aa4a0505c6249bca20e694bfe1dedd8.png?resizew=149)
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570118836822016/1570118841769984/STEM/fb61ae0252ed4bb896050f04d98ca4ee.png?resizew=215)
(1)在所给提示图中,作出该几何体的直观图;
(2)求该几何体的体积
.
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570118836822016/1570118841769984/STEM/0aa4a0505c6249bca20e694bfe1dedd8.png?resizew=149)
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570118836822016/1570118841769984/STEM/fb61ae0252ed4bb896050f04d98ca4ee.png?resizew=215)
(1)在所给提示图中,作出该几何体的直观图;
(2)求该几何体的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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真题
【推荐2】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/2014/6/23/1571791924559872/1571791930466304/STEM/e75e6771887b4a0ca0a40ec6078219b4.png)
(1)求四面体
的体积;
(2)证明:四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/c11c8ec8901047bfb28513231dfb97d1.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/0c2ab83522444ce6a250f32ed0777382.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/b75a0d3b5618401c8c42478f0501a328.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/0fccb83a14914aa4be421be96332c0a5.png)
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/e75e6771887b4a0ca0a40ec6078219b4.png)
(1)求四面体
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/c11c8ec8901047bfb28513231dfb97d1.png)
(2)证明:四边形
![](https://img.xkw.com/dksih/QBM/2014/6/23/1571791924559872/1571791930466304/STEM/4308da50ec7140919103d051b39fcbc7.png)
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【推荐1】如图,在四棱锥
中,底面
是菱形,平面
平面
,且
,
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/8b95dcd5-f2a3-4d78-bd45-09f9be5e6591.png?resizew=178)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bafa03b257f2a2835f871ecd87930af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeeee5f39ee6f9c3ea01ada75d63b93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/8b95dcd5-f2a3-4d78-bd45-09f9be5e6591.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ffc3552dd835a9ee6022bb11397a1bd.png)
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【推荐2】如图,在等腰梯形
中,
,
,矩形
所在的平面垂直于平面
,设平面
与平面
的交线为
.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699153967144960/2699608076574720/STEM/ef9669a42f5c4a8ba48490ad0a79204b.png?resizew=156)
(1)求证:
平面
;
(2)若二面角
的大小为
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852847ba02c2b62abf27e9cc11f596a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699153967144960/2699608076574720/STEM/ef9669a42f5c4a8ba48490ad0a79204b.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de7cb1d10dd759c0ebd487e4ca34ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-问答题
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解题方法
【推荐1】如图1,在等腰梯形
中,
,
,
,
.将
与
分别沿
,
折起,使得点
、
重合(记为点
),形成图2,且
是等腰直角三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/6f3aadc5-ac80-4c40-974b-43e3e4fba5c2.png?resizew=464)
(1)证明:平面
平面
;
(2)求二面角
的正弦值;
(3)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b173ac8cc4ac4f1c9e1daaa605fbb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea6d008b0a7d43b3af10e038dea8982.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/6f3aadc5-ac80-4c40-974b-43e3e4fba5c2.png?resizew=464)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013e58ab92ebfc889e2e0e2be903792e.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4cf4e5c97ecf44aa5201d912e6abaf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75764c506b7ff847a7960ed28371f49b.png)
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解答题-证明题
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【推荐2】如图,四棱锥
中,底面
为梯形,
,
,
,
底面
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cc9a4f07-3b90-4a0b-9e52-3bcd8ce84828.png?resizew=145)
(Ⅰ)求证:平面
平面
;
(Ⅱ)求点
到平面
的距离.
![](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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6abed28fd7b66cc392d16edc057d834.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/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cc9a4f07-3b90-4a0b-9e52-3bcd8ce84828.png?resizew=145)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54cf75bbfc9db93d27937c8b8e977b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
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