如图,将笔记本活页一角折过去,使角的顶点A落在
处,
为折痕,再将另一角
斜折过去,使
边落在
内部,折痕为
,点D的对应点为
,设
,则
的大小为________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5686730a081427d27fdc45997eca9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cba6e1f8eee0dcf8ffcace13fd1fb16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dbf4fa060c97af5aa13d93213a23b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899421382459392/2900606060879872/STEM/9642f19d-4159-41fb-87f1-e8ff2c6026e6.png?resizew=131)
更新时间:2022-01-23 12:41:02
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【推荐1】如图,AB
CD,
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【推荐1】如图,已知Rt△ABC中,∠ACB=90°,∠B=30°,BC=3,D是边AB上的一点,将△BCD沿直线CD翻折,使点B落在点B1的位置,若B1D⊥BC,则BD的长度为 _____ .
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