如图,在四边形ABCD中,AB=AD=2,∠DAB=∠DCA=60°,则
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b449764c77f10ebb358fcf0746f589a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975803288281088/2976484338393088/STEM/c96aa58bd04c4196a2d5012b025b79c5.png?resizew=161)
更新时间:2022-05-12 14:22:22
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【推荐1】如图,在矩形
中,对角线
,
相交于点
,
,
,点
在线段
上,从点
至点
运动,连接
,以
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和点
分别位于
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运动到点
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至点
运动过程中,
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(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】如图,
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,
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;…按这样的方法继续下去,则
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【推荐1】已知半径为
的
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.如图甲,当点
是弧
的中点时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
______ (用
的代数式表示);如图乙,当点
是弧
的中点时,且
,
的值为______ .
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【推荐2】如图,正方形ABCD中,E为AB上一点,
于点F,已知
,过C、D、F的
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______ .
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【推荐1】如图,
中,
,
,点
是
内一点,且
,
,
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的面积为______ .
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名校
【推荐2】在平行四边形
中(顶点A,B,C,D按逆时针方向排列),
,
,
,
,P是边
一动点,点C,D同时绕点P按逆时针方向旋转
得点
,
.
①如图1,若点
落在射线
上时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
___________________ .
②若
是以
为直角时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
____________________ .
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①如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4db79d5d4b937092176c6a4e5e3db1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3192692c9a9a58719c9904adc13c0341.png)
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【推荐1】“水晶晶南浔”的美食文化中以特有的双交画出名,盛面的瓷碗截面图如图1所示,碗体DEC呈抛物线状(碗体厚度不计),点E是抛物线的顶点,碗底高EF=1cm,碗底宽AB=2
cm,当瓷碗中装满面汤时,液面宽CD=8
cm,此时面汤最大深度EG=6cm,将瓷碗绕点B缓缓倾斜倒出部分面汤,如图2,当∠ABK=30°时停止,此时液面CH宽 _____ cm;碗内面汤的最大深度是 _____ cm.
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【推荐2】如图所示,在扇形
中,
,半径
,点F位于
的
处且靠近点A的位置.点C、D分别在线段
、
上,
,E为
的中点,连接
、
.在
滑动过程中(
长度始终保持不变),当
取最小值时,阴影部分的周长为____________.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/13b29ef6-6478-4dd0-b8cc-436e4e92a1ab.png?resizew=162)
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