(1)问题:如图1,在Rt△ABC中,∠BAC=90°,AB=AC,D为BC边上一点(不与点B,C重合).连接AD,过点A作AE⊥AD,并满足AE=AD,连接CE.则线段BD和线段CE的数量关系是 ,位置关系是 ;
(2)探索:如图2,当D点为BC边上一点(不与点B,C重合),Rt△ABC与Rt△ADE均为等腰直角三角形,∠BAC=∠DAE=90°,AB=AC,AD=AE.试探索线段BD、CD、DE之间满足的等量关系,并证明你的结论;
(3)拓展:如图3,在四边形ABCD中,∠ABC=∠ACB=∠ADC=45°,若BD=3,CD=1,则线段AD的长为
(2)探索:如图2,当D点为BC边上一点(不与点B,C重合),Rt△ABC与Rt△ADE均为等腰直角三角形,∠BAC=∠DAE=90°,AB=AC,AD=AE.试探索线段BD、CD、DE之间满足的等量关系,并证明你的结论;
(3)拓展:如图3,在四边形ABCD中,∠ABC=∠ACB=∠ADC=45°,若BD=3,CD=1,则线段AD的长为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4b08da9e-7ccc-419e-ad9a-ea25035c951f.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/d527337f-733b-42f4-b1ff-1201f7e1c397.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e854feab-ac7c-486c-b2a0-5702160dd3dc.png?resizew=200)
更新时间:2021-10-22 13:20:19
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,
,将
绕点
按顺时针方向旋转得到
,当点
恰好落在线段
上时,连接
,
的平分线
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/5/14/2720871107158016/2722163142000640/STEM/77410728-e265-4636-bfca-29cec8431dde.png)
(1)求
的长;
(2)求证:
、
、
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
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(1)求
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(2)求证:
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解答题-证明题
|
适中
(0.65)
【推荐2】已知
和
都是等腰直角三角形,
,点
是
的中点,连接
,
.
![](https://img.xkw.com/dksih/QBM/2020/3/27/2428550062686208/2429349190156288/STEM/7a47f7c5b7f64f40a12a3b4a7f45b5e8.png?resizew=376)
(1)当点
,
分别在
和
上时,如图1,试猜想线段
和
的数量关系,请直接写出你得到的结论(不要求证明);
(2)将
绕点
逆时针方向旋转一定角度后(旋转角度大于
,小于或等于
),如图2,请问:(1)中的结论是否仍然成立?如果成立,请给予证明;如果不成立,请说明理由.
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(1)当点
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(2)将
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在
中,
.将
绕点A顺时针旋转
得到
.
与
交于点F.
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(1)求证:
.
(2)设
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(1)求证:
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(2)设
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在
中,
,
为
上一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/0ec8ec32-18c8-4555-b8f3-e065011a6492.png?resizew=163)
(1)已知
,求证:
.
下面是两位同学分享的思路:
小快同学:从求证目标出发,倍长
到
,即
,又
,则只需证
.
小乐同学:从已知条件角的关系出发,发现若将
关于直线
对称得到
,则可证
为等腰三角形.
请你选择一种思路,完成证明
(2)已知
,
,请直接写出
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式子表示).
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(1)已知
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下面是两位同学分享的思路:
小快同学:从求证目标出发,倍长
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小乐同学:从已知条件角的关系出发,发现若将
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(2)已知
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解答题-作图题
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适中
(0.65)
【推荐1】张师傅要将一张残缺的圆形轮片恢复原貌(如图),已知轮片的一条弦
的垂直平分线交弧
于点
,交弦
于点
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,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/10c363e3-6efe-44ef-a336-c7dd90cb93da.png?resizew=139)
(1)请你帮张师傅找出此残片所在圆的圆心(尺规作图,不写作法,保留作图痕迹);
(2)求(1)中所作圆的半径.
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(1)请你帮张师傅找出此残片所在圆的圆心(尺规作图,不写作法,保留作图痕迹);
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在平面直角坐标系中有两点
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