解题方法
1 . 如图,有一边长为2cm的正方形
,
分别为
、
的中点.按图中的虚线翻折,使得
三点重合,制成一个三棱锥,并得到以下四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/c4411d41-ab0b-4f2c-98ef-798dfce10212.png?resizew=131)
①三棱锥的表面积为
;
②三棱锥的体积为
;
③三棱锥的外接球表面积为
;
④三棱锥的内切球半径为
.
则以上结论中,正确结论是______________ . (请填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef644115c956ed62c3da8310c6f67ecd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/c4411d41-ab0b-4f2c-98ef-798dfce10212.png?resizew=131)
①三棱锥的表面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
②三棱锥的体积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
③三棱锥的外接球表面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997b5842f3d4eae1989debee9ae41b9e.png)
④三棱锥的内切球半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
则以上结论中,正确结论是
您最近一年使用:0次