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解题方法
1 . 已知正三棱锥
的所有顶点都在球
的球面上,棱锥的底面是边长为
的正三角形,侧棱长为
,则球
的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 底面直径和高都是4的圆柱的体积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 一个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/2020/12/21/2618959904817152/2623871443501056/STEM/a9afe489-7b41-4e96-9377-dfd8b4c2537a.png?resizew=238)
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2020-12-28更新
|
63次组卷
|
2卷引用:宁夏贺兰县景博中学2020-2021学年高一上学期第二次月考数学试题
4 . 鳖臑(biē nào)是我国古代对四个面均为直角三角形的三棱锥的称呼.已知三棱锥
是一个鳖臑,其中
,且
,则三棱锥
的外接球的表面积是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03b050949b8fe7b275dd644c6356ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91769480262af4b195959b0155482e0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
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5 . 如图,在四棱锥
中,底面ABCD为菱形,
为正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/1e5576e0-d4b5-449c-855c-768d915cbe75.png?resizew=175)
(1)求证:平面PAC⊥平面PBD;
(2)在①
,②
,这两个条件中任选一个,补充在下面的横线上(填序号),并求解:
若PA=PC,
,________;求该四棱锥的体积.(注:如果选择两个条件分别解答,按第一个解答计分.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/1e5576e0-d4b5-449c-855c-768d915cbe75.png?resizew=175)
(1)求证:平面PAC⊥平面PBD;
(2)在①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85aeab3aeaf4367b711da8cde2e8bd.png)
若PA=PC,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
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解题方法
6 . 已知某几何体的三视图如下图所示,根据图中标出的尺寸(单位:
),可得这个几何体的体积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/77d2f5e7-664a-47e9-8b9e-3fc3eb2cb07d.png?resizew=223)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/77d2f5e7-664a-47e9-8b9e-3fc3eb2cb07d.png?resizew=223)
A.![]() | B.![]() | C.1 | D.2 |
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2020-12-21更新
|
75次组卷
|
2卷引用:宁夏六盘山市高级中学2020-2021学年高一上学期第二次月考数学试题
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7 . 已知棱长均为4,底面为正方形的四棱锥
如图所示,求它的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616987231453184/2619134701969408/STEM/55ed021d15ae42769d8c00ecd6ab2b6f.png?resizew=146)
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8 . 如图,在三棱柱
中,侧棱垂直于底面,
,
,
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/88410e84-2c9b-425e-8c55-11e9012ff54a.png?resizew=177)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16cfb38323095090b0fe5eee70b24210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.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://img.xkw.com/dksih/QBM/editorImg/2022/12/9/88410e84-2c9b-425e-8c55-11e9012ff54a.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80363c1f84e6e9b9e9435288022f77a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578fc8dd7d45fd2799f7d05ac89a2024.png)
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9 . 某几何体的三视图如下图所示,俯视图是边长为4的正三角形,则此几何体的表面积为_________ .
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616987231453184/2619134702141440/STEM/c8955c118bec48dca4ec4883502ecd05.png?resizew=338)
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10 . 如下图,下列几何体的俯视图是下面所示图形的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a70adf44-51ca-4f21-81fb-f901b1a68db3.png?resizew=70)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a70adf44-51ca-4f21-81fb-f901b1a68db3.png?resizew=70)
A.![]() | B.![]() |
C.![]() | D.![]() |
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