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1 . 已知球O为正四面体ABCD的内切球,E为棱BD的中点,AB=2,则平面ACE截球O所得截面圆的面积为__________ .
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2 . 如图,在四棱锥
中,底面
为边长为
的正方形,
.
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572544400367616/1572544406347776/STEM/26a8eee53dad4995a07b391225f17f9c.png?resizew=247)
(1)求证:
;
(2)若
,
分别为
,
的中点,
平面
,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/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
![](https://img.xkw.com/dksih/QBM/2016/3/17/1572544400367616/1572544406347776/STEM/26a8eee53dad4995a07b391225f17f9c.png?resizew=247)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d0710321d97361e5782124bbf7f0c9.png)
(2)若
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade68d3f913ba0357f38a808392f5820.png)
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3卷引用:【全国百强校】甘肃省天水市第一中学2019届高三下学期第五次模拟考试数学(文)试题
3 . 如图,网格纸上小正方形的边长为1,粗实线画出的是某几何体的三视图,则该几何体的体积为( )
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119468520939520/2120517873098752/STEM/b4695e4d563240b081dcc0e0d0894395.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119468520939520/2120517873098752/STEM/b4695e4d563240b081dcc0e0d0894395.png?resizew=195)
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:【校级联考】甘肃省通渭县2017-2018学年高一上学期期末考试数学试题
4 . 如图,在四棱锥
中,平面
平面
,底面
是一个梯形,且
,
是等边三角形,已知
.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625399353573376/1626177933950976/STEM/3ec27ea6985140a8b75e748b0b2b6dd0.png?resizew=205)
(1)设
是
上的一点,证明:平面
平面
;
(2)求四棱锥
的体积;
(3)当
点位于线段
什么位置时,
平面
?请证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f43af9baf063de814342c59ec47ffb57.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625399353573376/1626177933950976/STEM/3ec27ea6985140a8b75e748b0b2b6dd0.png?resizew=205)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fb16d2f0db758b8b7a8d3743143f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
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5 . 表面积为
的球面上有四点
,
,
,
且
是等边三角形,球心
到平面
的距离为
,若平面
平面
,则棱锥
体积的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d559c89eb42798e31fdca19eafc3a582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
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2014·甘肃兰州·一模
6 . 平行四边形
中,
,沿
将四边形折起成直二面角
,且
,则三棱锥
的外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd491d367eb613a744a8682b2d4d9644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f193dbc22cb5bf7162c04010cf56749a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 一个空间几何体的三视图如图所示,则该几何体的体积为
![](https://img.xkw.com/dksih/QBM/2017/3/8/1639336304287744/1642410453180416/STEM/ec35ca05e1bf47d0b1b34afdfc9ee51f.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2017/3/8/1639336304287744/1642410453180416/STEM/ec35ca05e1bf47d0b1b34afdfc9ee51f.png?resizew=207)
A.![]() | B.![]() | C.![]() | D.![]() |
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