如图1是长方形纸带,
,将纸带沿
折叠成图2,再沿
折叠成图3,则图3中的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d060b523623f7dd4ba63470ceb4ca0b.png)
_______ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa70576a9ed414410364060407eaf0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d060b523623f7dd4ba63470ceb4ca0b.png)
更新时间:2024-04-16 20:59:32
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【推荐2】图1是某折叠式靠背椅的实物图,支撑杆
,
可绕连接点O转动,椅面底部有根可以绕点H 动的连杆
,
段在转动过程中形状保持不变.图2是椅子合拢状态的侧面示意图,椅面
和靠背
平行,测得
,
,则靠背
与水平地面
的夹角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
________
.如图3,打开时椅面
与地面
平行,延长
交
于点H,
平分
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图,在
中,
,
,在平面内有一点C,满足
,
,
,则A到
的距离![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e776314d1f1670d3a90f2a35125feb67.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
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【推荐2】如图,
的直径BA的延长线与弦DC的延长线交于点E,且
,已知
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等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,矩形ABCD中,AB=6,BC=8,E为AD中点,F为AB上一点,将△AEF沿EF折叠后,点A恰好落到CF上的点G处,则折痕EF的长是_____ .
![](https://img.xkw.com/dksih/QBM/2020/9/18/2552221373235200/2555251398311936/STEM/4e5d94e79898497cb1d1f7a8d1b8724f.png?resizew=150)
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