沿对角线
将正方形
折成直二面角后,
与
所在的直线所成的角等于_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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13-14高二下·浙江绍兴·期末 查看更多[2]
更新时间:2016-12-03 03:52:24
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解题方法
【推荐1】在三棱锥
中,
,二面角
为
,则三棱锥
的外接球的表面积为______________ .
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【推荐2】以等腰直角三角形ABC斜边BC上的高AD为折痕,将△ABC折成二面角
等于____________ .时,在折成的图形中,△ABC为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2898853a3396f0878af9eac934416d.png)
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【推荐1】如图,四边形
中,
为等边三角形,
为等腰直角三角形,
,
,现将
沿
折起,当二面角
为
时,异面直线
与
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】已知长方体
中,
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上靠近点
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的夹角为
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的夹角为
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之间的大小关系为________ .(横线上按照从小到大的顺序进行书写)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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