在等边三角形
中,
为
中点,将
沿
折起至
,使得
,则直线
与平面
所成角的正弦值为___________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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22-23高二上·吉林·期中 查看更多[2]
更新时间:2022-11-15 18:02:43
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【推荐1】三棱锥
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【推荐2】如图,已知长方体
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