如图,在 Rt
中,∠C=90°,AC=BC,在线段 CB延长线上取一点P,以 AP为直角边,点 P为直角顶点,在射线 CB上方作等腰 Rt
APD ,过点 D 作 DE⊥CB,垂足为点 E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/7b8a530b-470a-40cf-89e3-ddaf21d031bc.png?resizew=268)
(1)依题意补全图形;
(2)求证:∠APC=∠PDE;
(3)求证:AC=PE;
(4)连接 DB,并延长交 AC的延长线于点 F,用等式表示线段CF与AC的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/7b8a530b-470a-40cf-89e3-ddaf21d031bc.png?resizew=268)
(1)依题意补全图形;
(2)求证:∠APC=∠PDE;
(3)求证:AC=PE;
(4)连接 DB,并延长交 AC的延长线于点 F,用等式表示线段CF与AC的数量关系,并证明.
更新时间:2020-07-04 14:26:28
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
,AD平分
,交BC于点D,P是AD上的一点(不与点D重合),
于点E.
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772185633390592/2802136312291328/STEM/74749060-a4c5-43fe-9d22-15520d7ed7a3.png?resizew=682)
(1)若
,如图1,当点P与点A重合时,求
的度数.
(2)当
是锐角三角形时,如图2,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab74bb80fd9af8c46c88b7eb82a0976.png)
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![](https://img.xkw.com/dksih/QBM/2021/7/26/2772185633390592/2802136312291328/STEM/74749060-a4c5-43fe-9d22-15520d7ed7a3.png?resizew=682)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dffd1b6d3a0638cc5b9dcbe9a9e0829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16523b4ed5a2d674c60cafaad10500d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaa911fc4ad43bdcda7bf46fcac1324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fe9ad30cf68ed7194acb556967087a.png)
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【推荐2】如图,在锐角
中,
,
分别是
的高和角平分线,
是直线
(不与
重合)上任意一点,且
于
.
(1)如图①,当点
与点
重合时,请你写出图中
与
、
之间的数量关系吗?并说明理由.
(2)如图②,当点
在线段
上时,若
,则
的度数为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e9019487563439986e1106739c4845.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4567ae3f7827588855f39569d4f7c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/909fd54d-92ae-4608-a279-8756bd5a91cd.png?resizew=250)
(1)如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
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解答题-证明题
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(0.65)
【推荐1】如图在△ABC中,∠ACB=90°,AC=BC,AE是BC的中线,过点C作CF⊥AE于F,过B作BD⊥CB交CF的延长线于点D.
![](https://img.xkw.com/dksih/QBM/2019/10/28/2321644680462336/2326068191019008/STEM/87c1c75ba1d64f4b86dff171a9e012fb.png?resizew=123)
(1)求证.AE=CD;
(2)若BD=5㎝,求AC的长.
![](https://img.xkw.com/dksih/QBM/2019/10/28/2321644680462336/2326068191019008/STEM/87c1c75ba1d64f4b86dff171a9e012fb.png?resizew=123)
(1)求证.AE=CD;
(2)若BD=5㎝,求AC的长.
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解答题-问答题
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【推荐2】已知:如图,在
中,
,
,
,点
、
分别是直线
、
上一个动点.
(1)若
是等腰三角形,请直接写出
的长是______;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
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(1)若
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(2)若
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,将两个完全相同的三角形纸片和
重合放置,其中
,
.
(1)操作发现
如图②,固定,使
绕点C旋转,当点D恰好落在
边上时,
①求线段与
的位置关系;
②设的面积为
,
的面积为
,求
与
的数量关系.
(2)猜想论证
当绕点C旋转到如图③所示的位置时,小明猜想(1)中
与
的数量关系仍然成立,并尝试分别作出了
和
中
、
边上的高,请你证明小明的猜想.
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解答题-证明题
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名校
【推荐2】如图所示,A,E,F,C在一条直线上,AE=CF,过E,F分别作DE⊥AC,BF⊥AC,且AB=CD,求证:EG=FG.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894098021302272/2894890414424064/STEM/0fb029bc-59e2-4b53-b820-2b9d1d5135e7.png?resizew=264)
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【推荐1】定义:若一个三角形存在两边平方和等于第三边平方的3倍,则称此三角形为“平方倍三角形”.
(1)若一个三角形的三边长分别是
,
和2,这个三角形是否为平方倍三角形?请你作出判断并说明理由.
(2)若一个直角三角形是平方倍三角形,求该直角三角形的三边之比(结果按从小到大的顺序排列).
(3)如图,
中,
,
是
的中线且
.若
是平方倍三角形,求
的面积.
(1)若一个三角形的三边长分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68c1d20a422a363e356a160f096503c.png)
(2)若一个直角三角形是平方倍三角形,求该直角三角形的三边之比(结果按从小到大的顺序排列).
(3)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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适中
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【推荐2】在
中,
,点
是边
上的一点,连接
,
.
的理由;
(2)如图2,过点
作
,垂足为点
,
与
相交于点
.
①试说明
的理由;
②如果
是等腰三角形,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbbf470efc0ca30e0f5bbc5cb5bad1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd98a41b95034c56eeeb2ca76d38324.png)
②如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa2e940d7b4caaf9503490478b5ed0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f2e07c7d33985d4b447f87cabe16cb.png)
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