1 . 如图,一块半径为4的圆形铁片上有3块阴影部分,将这些阴影部分裁下来,然后用余下的正三角形沿虚线加工成一个正三棱锥,则该正三棱锥的( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/62f2fb67-5c5b-49cc-8f4a-7ceb9992651d.png?resizew=136)
A.表面积为![]() | B.表面积为![]() |
C.体积为![]() | D.体积为![]() |
您最近一年使用:0次
2 . 如图,已知在长方体
中,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764853762179072/2775391841681408/STEM/9542d112171245629ba97725cb3c3eef.png?resizew=209)
(1)求证:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ccf3c5561e747353e5914b6f612db7c.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764853762179072/2775391841681408/STEM/9542d112171245629ba97725cb3c3eef.png?resizew=209)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2147971abecf15404665d75f577ebfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84c4fa63b2f77ded57f6b4a07d619c2.png)
您最近一年使用:0次
名校
解题方法
3 . 如图,在四棱锥
中,底面
是平行四边形,
,侧面
底面
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534261204631552/2542443310964736/STEM/06305e9c-8810-4ede-9ec2-5ba57a5f9a33.png?resizew=153)
(1)求证:
平面
;
(2)过
的平面交
于点
,若
,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/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99998f33ad6edab18180627d4903dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaa14690732aac2d2b8e2561ebbc047.png)
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534261204631552/2542443310964736/STEM/06305e9c-8810-4ede-9ec2-5ba57a5f9a33.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9f5de9503f4d71588c16b0ac33742a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd3b6cf2e17d221c8aaeb70e81ef48.png)
您最近一年使用:0次
2020-09-04更新
|
385次组卷
|
3卷引用:贵州省毕节市威宁县2019-2020学年高一下学期期末考试数学试题
4 . 据说伟大的阿基米德逝世后,敌军将领马塞拉斯给他建了一块墓碑,在墓碑上刻了一个如图所示的图案,图案中球的直径、圆柱底面的直径和圆柱的高相等,圆锥的顶点为圆柱上底面的圆心,圆锥的底面是圆柱的下底面.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/b387f30d-d7c1-422b-9d35-f92b8bd46e2b.png?resizew=98)
(1)试计算出图案中圆柱与球的体积比:
(2)假设球半径
,试计算出图案中圆锥的体积和表面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/b387f30d-d7c1-422b-9d35-f92b8bd46e2b.png?resizew=98)
(1)试计算出图案中圆柱与球的体积比:
(2)假设球半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8176754726d2194c890e80df1a1f1c3a.png)
您最近一年使用:0次
2020-09-04更新
|
627次组卷
|
5卷引用:贵州省毕节市威宁县2019-2020学年高一下学期期末考试数学试题
解题方法
5 . 已知圆锥的表面积为
,它的侧面展开图是一个半圆,则此圆锥的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ae3e6e1924f2f92529860e905c9d32.png)
A.3 | B.![]() | C.9 | D.![]() |
您最近一年使用:0次
6 . 在三棱柱
中,侧面
底面
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2018/7/19/1991608280899584/1993175032602624/STEM/3d3e713b-0ce0-45d7-a8b7-36f009c8d705.png)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/8c225227c5286ac081bda3943338bf5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f0156584f5feb543efc57973e51e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/7/19/1991608280899584/1993175032602624/STEM/3d3e713b-0ce0-45d7-a8b7-36f009c8d705.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5830646a912c3a916beac4f88c116b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a98287a302228ece1fa53c5c66c590f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eedadb500cb9faa9de59d0cfdf338c0.png)
您最近一年使用:0次
2018-07-21更新
|
807次组卷
|
2卷引用:【全国市级联考】贵州省毕节市2017-2018学年高一下学期期末考试数学试题
解题方法
7 . 在四面体
中,
,
,
.当四面体
体积最大时,直线
与平面
所成的角是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb113566b4370e754e979b8098aabf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](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/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次