用平面去截一个正四棱柱,使截面为菱形,且有一个内角为
,则截面与底面所成的二面角大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
2007高三·上海·竞赛 查看更多[1]
更新时间:2018-12-07 20:49:25
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