如图,在△ABC中,AB=AC=5,BC=6,AD为BC边上的高,过点A作AE∥BC,过点D作DE∥AC,AE与DE交于点E,AB与DE交于点F,连接BE.
(1)求证:四边形AEBD是矩形.
(2)求四边形AEBD的周长.
(1)求证:四边形AEBD是矩形.
(2)求四边形AEBD的周长.
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757657832431616/2796429296599040/STEM/ffc6ad680512453ea8e5b6536b26d448.png?resizew=185)
20-21八年级下·湖南邵阳·期末 查看更多[2]
更新时间:2021-08-29 08:12:52
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【推荐1】对于任意实数a,b,定义关于“
”的一种运算如下:
.例如:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd86361e2789dccc5e50e9f6f30481a.png)
(1)若
,且
,求x,y的值;
(2)在(1)的条件下,求以x,y为边长的等腰三角形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d6468db74e8d6a6904fe6bb38bdcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd86361e2789dccc5e50e9f6f30481a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c1531c25aef2fbcd98d4e6b5708632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0db0d052c7d3e1f23f2e9d755e92a9c.png)
(2)在(1)的条件下,求以x,y为边长的等腰三角形的面积.
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【推荐1】已知
为钝角三角形,其中
,有下列条件:
①
;②
;③
;
(1)你认为从中至少选择______个条件,可以求出
边的长;
(2)你选择的条件是______(直接填写序号),并写出求
的解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487a1cc71049c2369b669c192c0b73c3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7bd6bf0b1747af4e9e49a2c5eaebf2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f20c0125350eefaaa203a7ea5e6759.png)
(1)你认为从中至少选择______个条件,可以求出
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(2)你选择的条件是______(直接填写序号),并写出求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,在△ABC中,∠B=90°,AB=5,BC=12.
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(1)用直尺和圆规在BC边上找一点D,使点D到AC的距离与DB的长相等;
(2)求△ADC的面积.
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914013619494912/2924183924768768/STEM/aa8da084-a009-42fe-96fa-a1ecee5717af.png?resizew=287)
(1)用直尺和圆规在BC边上找一点D,使点D到AC的距离与DB的长相等;
(2)求△ADC的面积.
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【推荐1】如图,在四边形
中,
,点D,F分别在边
上,
.若
,猜想四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
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【推荐2】如图,在
中,
,点D为
边上任意一点(不与点A、B重合),过点D作
,
,分别交
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于点E、F,连接
.
是矩形;
(2)若
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,求点C到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebe3790c704e9bf83d7913deca22e5a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989da05750d7232b0db2eb4e37434461.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
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【推荐1】小颖、小亮想利用刚学过的测量知识来测量某公园的一棵古树
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的高度.(结果保留根号)
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【推荐2】如图,
为矩形
对角线的交点,
,
.
(1)试判断四边形
的形状,并说明理由;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
(2)若
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