(1)问题情境:如图1,在正方形ABCD中,E、F、G、H分别为AB,BC,CD,DA边上的动点,连接EG,HF相交于点O,且∠HOE=∠ADC.试探究:EG与FH的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2016/7/21/1574221402087424/1574221408329728/STEM/3ec175c41ce547c2b830f20f981bf64c.png)
(2)拓展延伸:如图2,在菱形ABCD中,E、F、G、H分别为AB,BC,CD,DA边上的动点,连接EG,HF相交于点O,且∠HOE=∠ADC,试探究:(1)中EG与FH的数量关系还成立吗?并说明理由.
(3)反思提升:若将(2)中的菱形ABCD改为平行四边形ABCD(如图3),AB=a,AD=b,其他条件不变,则
的猜想正确吗?请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/7/21/1574221402087424/1574221408329728/STEM/3ec175c41ce547c2b830f20f981bf64c.png)
(2)拓展延伸:如图2,在菱形ABCD中,E、F、G、H分别为AB,BC,CD,DA边上的动点,连接EG,HF相交于点O,且∠HOE=∠ADC,试探究:(1)中EG与FH的数量关系还成立吗?并说明理由.
(3)反思提升:若将(2)中的菱形ABCD改为平行四边形ABCD(如图3),AB=a,AD=b,其他条件不变,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100dc699429c663f9da62041da92259d.png)
更新时间:2016-12-06 13:04:33
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相似题推荐
解答题-证明题
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【推荐1】(1)如图
,等腰直角
中,
,
,线段
经过点
,过A作
于点
,过
作
于
求证:
≌
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c428f0a1-1dde-4c50-9250-19a48b6b2686.png?resizew=622)
(2)如图
,已知在平面直角坐标系
中,
为坐标原点,点
的坐标为
,点
的坐标为
,点
是平面直角坐标系中的一点,若
是以
为直角边的等腰直角三角形,求点
的坐标;
(3)如图
,已知在平面直角坐标系
中,
为坐标原点,在等腰直角
中,
,
,点
在线段
上从
向
运动
运动到点
停止
,以点
为直角顶点向右上方作等腰直角
,求点
移动的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323b786e35c9b762d00f2b2ef74ce1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c388d0a3f0a8d9fb0b9576d00af225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c60ab4cdefda079244161bb911a453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e28ce60503fab70ce1797449d90dadc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf94bbdc11e2942b20368833c7d7a787.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c428f0a1-1dde-4c50-9250-19a48b6b2686.png?resizew=622)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ec371d5dbc19d236bf8a1f084031e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32279cf0de44707705018bc58e08074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】如图,
是
的边
上一点,
,
交
于点
,若
.
(1)求证:四边形CDBE是平行四边形;
(2)若
,
,求四边形CDBE的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d1ee2efdb2c3b7c90198efc88010db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07b92b8282c7fd1158b3b5098e38c39.png)
(1)求证:四边形CDBE是平行四边形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f426d6a7cd1cc3436ca4d56edeaa3010.png)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497382739312640/2498012059557888/STEM/cf3b787909014f2f9120a3fe8b4de029.png?resizew=226)
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【推荐1】我们知道:有两条边相等的三角形叫做等腰三角形.类似地,我们定义:至少有一组对边相等 的四边形叫做等对边四边形.
(1)请你写出一个等对边四边形的名称;
(2)如图,在△ABC中,点D、E分别在AB、AC上,设CD、BE相交于点O,若∠A=50°,
.请写出图中其余等于50°的角,并猜想图中哪个四边形为等对边四边形(不需证明);
(3)在
中,如果∠A是不等于50°的锐角,点D、E分别在AB、AC上,且
.探究:满足上述条件的图形中是否存在等对边四边形,并证明你的结论.
(1)请你写出一个等对边四边形的名称;
(2)如图,在△ABC中,点D、E分别在AB、AC上,设CD、BE相交于点O,若∠A=50°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67513f4b39379183858a66ffa75b675b.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67513f4b39379183858a66ffa75b675b.png)
![](https://img.xkw.com/dksih/QBM/2019/10/5/2305380495163392/2305684383047680/STEM/333712505ba941da8b971a16cec445f2.png?resizew=169)
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【推荐2】如图所示,在梯形ABCD中,已知AB∥DC, AD⊥DB,AD=DC=CB,
AB=4.以AB所在直线为
轴,过D且垂直于AB的直线为
轴建立平面直角坐标系.
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320782061568/1573320822439936/STEM/f65c43a87bcb4821ad1fdbe057246eaf.png?resizew=292)
(1)求∠DAB的度数及A、D、C三点的坐标;
(2)求过A、D、C三点的抛物线的解析式及其对称轴L.
(3)若P是抛物线的对称轴L上的点,那么使
PDB为等腰三角形的点P有几个?(不必求点P的坐标,只需说出个数即可)
AB=4.以AB所在直线为
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320782061568/1573320822439936/STEM/06f8b8b4b0294828a8e04a988dfd844a.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320782061568/1573320822439936/STEM/08f2e0b525984ac3b05bb4a5f90e7f00.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320782061568/1573320822439936/STEM/f65c43a87bcb4821ad1fdbe057246eaf.png?resizew=292)
(1)求∠DAB的度数及A、D、C三点的坐标;
(2)求过A、D、C三点的抛物线的解析式及其对称轴L.
(3)若P是抛物线的对称轴L上的点,那么使
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320782061568/1573320822439936/STEM/bc06be325ae74c09a7aad803924b13b2.png?resizew=15)
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【推荐3】如图,在梯形ABCD中,AD//BC,∠B=90°,AD=16cm,AB=12cm,BC=21cm,动点P从点B出发,沿射线 BC的方向以每秒2cm的速度运动,运动到点C返回 .动点Q从点A出发,在线段 AD上以每秒1cm的速度向点D运动,点P,Q分别从点B,A同时出发,当点Q运动到点D时,点P随之停止运动,设运动的时间为t(秒).
(1)当t为何值时,四边形PQDC是平行四边形.
(2)当t为何值时,以C,D,Q,P为顶点的梯形面积等于60cm2?
(3)是否存在点P,使△PQD是等腰三角形(不考虑QD=PD)?若存在,请直接写出 所有满足要求的t的值,若不存在,请说明理由.
(1)当t为何值时,四边形PQDC是平行四边形.
(2)当t为何值时,以C,D,Q,P为顶点的梯形面积等于60cm2?
(3)是否存在点P,使△PQD是等腰三角形(不考虑QD=PD)?若存在,请
![](https://img.xkw.com/dksih/QBM/2019/4/23/2188727882203136/2190276334575616/STEM/c76dd81530ac4e2a9669382188f83f9f.png?resizew=227)
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【推荐1】【教材呈现】如图是华东师大版八年级下册数学教材121页,
完成上面的证明过程.
【应用】
如图①,在正方形
中,
,连结
,若正方形的边长为5,四边形
的面积为18,则
的长为__________.
【拓展】
如图②,在矩形
中,
,点E为
中点,连接
,交
于点F,则
的长为__________.
2.如图,在正方形![]() ![]() ![]() ![]() |
【应用】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/0e0833d5-7119-4d69-b2b5-f34442f6102c.png?resizew=333)
如图①,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b84ed8d927b77491092f7d2ee2989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833ee84968e2c903b6350c23943b4fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
【拓展】
如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f061e058e3ba47a8b3a1de39d13284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167fb77440071253755f845c9a50c6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐2】如图,在
中,
为
上一点,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c15b9224-a044-4bca-ab96-f94e673ab392.png?resizew=215)
(1)求证:
;
(2)若
的面积为18,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c15b9224-a044-4bca-ab96-f94e673ab392.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7238631318e2fbd5b8183aed24f050d6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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