图1是一张可以折叠的小床展开后支撑起来放在地面的示意图,此时,点A,B,C在同一直线上,且∠ACD=90°,图2是小床支撑脚CD折叠的示意图,在折叠过程中,
ACD变形为四边形
,最后折叠形成一条线段
,若AB:BC=2:9,则sinD的值是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d764305279c903197f1a0c33cb54d763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc86791deedbb095f6dea4309c6239d.png)
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更新时间:2022-03-31 15:07:07
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【推荐1】正方形
中,点
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上一点,若
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【推荐2】如图,在矩形ABCD中,F是DC上一点,BF⊥AC,垂足为E,
,△CEF的面积为S1,△AEB的面积为S2,则
的值等于_________ .
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【推荐1】如图,在菱形
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【推荐2】如图,在长方形纸片
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【推荐1】为解决停车难得问题,在如图一段长56米的路段开辟停车位,每个车位是长5米、宽2.2米的矩形,矩形的边与路的边缘成45°角,那么这个路段最多可以划出____ 个这样的停车位(
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