如图,在正方形ABCD中,AB=6,点E在AB边上,CE与对角线BD交于F,连接AF,若AE=2,则sin∠AFE的值是____
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465252866326528/2466279296622592/STEM/d782dedb2c7e49b5b32afb7baac4e724.png?resizew=101)
2020九年级·浙江台州·学业考试 查看更多[3]
更新时间:2020-05-19 21:20:59
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【推荐1】如图,扇形
中,
.
为弧
上的一点,过点
作
,垂足为
,
与
交于点
,若
,则该扇形的半径长为___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
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【推荐2】如图,点E为矩形
的边
上一点,
,
,将
沿
翻折得到
,使点F落在矩形内部,连接
.若
平分
,则
的长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,正方形
的边长为
,顺次连接正方形
四边的中点得到第一个正方形
,又顺次连接正方形
四边中点得到第二个正方形
,….以此类推,则第六个正方形
的周长是______ ;面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
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【推荐2】正方形A1B1C1O,A2B2C2C1,A3B3C3C2,…按如图所示放置,点A1,A2,A3,…和C1,C2,C3,…分别在直线y=x+1和x轴上,则点B2020的纵坐标是_____ ,点Bn的纵坐标是_____ .
![](https://img.xkw.com/dksih/QBM/2020/5/5/2455917696761856/2456228964384768/STEM/31fa1182f7eb497482bb6a5fba676f4c.png?resizew=191)
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【推荐1】如图,练习本中的横格线都平行,且相邻两条横格线间的距离都相等,同一条直线上的三个点A、B、C都在横格线上,若线段AB=4 cm,则线段BC=______ cm
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【推荐2】如图,在
中,点
,
分别在
,
边上,且
,如果
,
,那么
的长等于________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐1】如图,矩形ABCD中,点E是BC边上的点,BE=2,EC=1,AE=BC,DF⊥AE,垂足为F.则
等于____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89119e212385b76c35698f5cfe54b606.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/ee06927c-e705-4e62-a63d-8a83bfe990da.png?resizew=165)
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【推荐2】在等腰直角三角形ABC中,
,
,D为
的中点,作
关于
的对称图形
,并连接
.
(1)
的长为;______ ;(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2635adc836cf00ac5cdb4af5523f47.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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(1)
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