解题方法
1 . 如图,在三棱柱
中,底面
是正三角形,
平面
,
,D是
边上的一点,且
为
的平分线,若在三棱柱
中去掉三棱锥
后得到的几何体的表面积为
,则a的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d20564320dc28e1b429ec389ccf309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5445220e9b81a876e359615859a5a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ad7c72dfe524eb8aaa00b33108a880.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/fcf5f905-262c-49fd-9627-80e74cc5affc.png?resizew=124)
您最近一年使用:0次
2022-08-19更新
|
172次组卷
|
2卷引用:苏教版(2019) 必修第二册 过关斩将 第13章 13.3.1 空间图形的表面积
解题方法
2 . 如图,在四棱锥
中,
底面
,底面
是矩形,
,
,点
在棱
上,且
,则当
的面积取最小值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e3242479386328d34750a38bd10d8.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/91ce0586aafd9bf4fb7e1be082624afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe657996fea451eca0609ab23106e768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0e2d85a6b3c59d3d0309277aa168c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e3242479386328d34750a38bd10d8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/15/2700235661049856/2700514734735360/STEM/3c040103-1cde-4e24-8110-767348f98775.png?resizew=191)
您最近一年使用:0次
解题方法
3 . 某圆锥母线长为4,其侧面展开图为半圆面,则该圆锥高为________ .
您最近一年使用:0次