解题方法
1 . 如图,A,B,C是正方体的顶点,
,点P在正方体的表面上运动,若三棱锥
的主视图、左视图的面积都是1,俯视图的面积为2,则三棱锥
的体积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/872bd373-b079-4763-be0f-d48f9961083a.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/872bd373-b079-4763-be0f-d48f9961083a.png?resizew=158)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
2 . 已知某几何体的一条棱的长为
,该棱在正视图中的投影长为
,在侧视图与俯视图中的投影长为
与
,且
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b40b1544e62be8b9e9f4dc9f2c0c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.2 |
您最近一年使用:0次
2018高一上·全国·专题练习
3 . 如图所示,画出下列组合体的三视图.
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071052606316544/2071800329986048/STEM/af01fc631b984e0f81ac1339a8cd9738.png?resizew=218)
您最近一年使用:0次
名校
4 . 如下图,在正方体
中,点
是棱
上一点,则三棱锥
的侧视图是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/184bfb67-51dd-410d-8f2b-56bcd3583910.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f93a895ea4c22fceaa84f8eeab9801d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/184bfb67-51dd-410d-8f2b-56bcd3583910.png?resizew=154)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次