如图,在等腰直角三角形ABC中,AB=AC, ∠BAC=90°,O为BC的中点,D为AC斜下方一点,
,则AD的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1b3d261b689f10f698364e926aec3d.png)
![](https://img.xkw.com/dksih/QBM/2021/1/20/2640351818612736/2640772067696640/STEM/07e4e3df-edfa-458e-a3cf-6dff4e48426a.png?resizew=205)
21-22九年级上·湖北武汉·阶段练习 查看更多[1]
(已下线)湖北省武汉开发区一初2020-2021九年级上学期元月调考模拟试题
更新时间:2021-01-21 10:07:26
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【推荐1】如图,已知正方形
,将边
绕点
顺时针旋转45°,得到线段
,连接
、
,
,则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,矩形
的对角线
,
交于点
,过点
作
,交
于点
,过点
作
,垂足为
,
,
,则线段
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐1】如图,点
为等边三角形
内一点,且
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c163a189c44fd9e9234bedd4dd96625c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/021ef9ac-39f5-41d5-aadd-168a0147711d.png?resizew=156)
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解题方法
【推荐2】如图,
中,
, 将
绕点
逆时针旋转
,得到
过
作
交
的延长线于点
,连接
并延长交
于点
,连接
交
于点
.下列结论:①
平分
;②
; ③
; ④
; ⑤
是
的中点,其中正确的是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424ae1a07801ea54f1def87b2af79579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55c97f2de7202a49a899c7cce2d7ba9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c2b216ea71198ef67739e04f7ab2b1.png)
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【推荐1】如图,正方形
中,以
为边在正方形内部作等边
,
与
交于点H,连接
.则下列说法正确的是___________ (填序号).
①
平分
;②
;③
;④四边形
的面积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20f5298aff67dbf8441c082ae7932a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f8b0e5e244177967dc22556eb02857.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/204a9b72-7d75-4069-af0c-65f92163eb56.jpg?resizew=189)
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【推荐2】已知在
中,
,
,
.点
为边
上的动点,点F为边
上的动点,则线段
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcc960364ba71da42fcab71795ab5e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3b8395693a60a50afc2f0e821237eb.png)
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【推荐1】如图,菱形ABCD中,∠BAD=120°,对角线相交于点O,点E、F分别是边BC、CD上的点,且∠EAF=60°,连接AE、AF分别交对角线BD于点M、N,若AB=5,DN=2
,则△AMN的面积为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828686979219456/2828980073848832/STEM/73972c27-12f0-460c-9746-93411ea8fb4f.png?resizew=277)
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名校
【推荐2】如图,在平面直角坐标系中,直线AB经过点
和
,将
沿直线AB翻折,点O的对应点C恰好落在反比例函数
的图象上,则k的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d74a3ea895003024e74d3a01dae2dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d242d65be05a08a46b5931e2466b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
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