如图,
中,
,
,
,
绕点
顺时针旋转得
,当
落在
边上时,连接
,取
的中点
,连接
,则
的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/4c143c8d-92a3-4a09-9b11-e69385837b07.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/4c143c8d-92a3-4a09-9b11-e69385837b07.png?resizew=211)
A.2 | B.![]() | C.![]() | D.3 |
更新时间:2022-03-21 22:16:21
|
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【推荐1】如图,在
中,对角线
,
交于点
,
平分
交
于点
,连结
.若
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的长为( )
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A.![]() | B.![]() | C.7 | D.![]() |
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【推荐2】如图,AB为⊙O的直径,C为⊙O上的一点,AD垂直于过点C的切线,垂足为点D,∠BAC=30°,AB=6,则AE的长为( )
![](https://img.xkw.com/dksih/QBM/2022/1/16/2902635648122880/2973370488266752/STEM/91e8d886-edc8-4951-a641-a93ddc316ade.png?resizew=155)
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【推荐1】如图,△ABC是等边三角形,P是三角形内一点,PD∥AB,PE∥BC,PF∥AC,若△ABC的周长为24,则PD+PE+PF=( )
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946120454995968/2948120717565952/STEM/f0e1ab94-ed0c-4094-b90a-4c4205680baa.png?resizew=155)
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【推荐2】对折矩形纸片
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,把纸片展开(如图1),再一次折叠纸片,使点A落在
上,并使折痕经过点
,得到折痕
,同时得到线段
(如图2),若延长
交
于点
(如图3),则下列说法错误的是( )
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【推荐2】如图,以数轴的单位长为边作一个正方形,以数轴的原点为圆心,正方形的对角线长为半径画弧,交数轴于点A,则点A表示的数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/30/0c2ea924-9189-48c5-8e30-33fc2ea65731.png?resizew=218)
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【推荐1】如图所示,在△ABC中,∠CAB=70°,现将△ABC绕点A顺时针旋转一定角度后得到△AB′C′,连接BB′,若BB′∥AC′,则∠CAB′的度数为( )
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【推荐2】如图,
为等边三角形,以
为边向外作
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,再以点C为旋转中心把
旋转到
,则给出下列结论:①D,A,E三点共线;②
平分
;③
;④
.其中正确的有( )
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