如图,将长方形纸片ABCD沿对角线BD折叠得到△BDE,DE交AB于点G.
![](https://img.xkw.com/dksih/QBM/2016/1/15/1573955432620032/1573955438362624/STEM/4990088cb27b4eb0920a7e43e7fc9684.png)
(1)求证:DG=BG;
(2)若AD=4,AB=8,求△BDG的面积.
![](https://img.xkw.com/dksih/QBM/2016/1/15/1573955432620032/1573955438362624/STEM/4990088cb27b4eb0920a7e43e7fc9684.png)
(1)求证:DG=BG;
(2)若AD=4,AB=8,求△BDG的面积.
更新时间:2016-12-06 04:03:26
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【推荐1】如图,已知在矩形ABCD中,BC=2CD=2a,点E在边CD上,在矩形ABCD的左侧作矩形ECGF,使CG=2GF=2b,连接BD,CF,连结AF交BD于点H.
![](https://img.xkw.com/dksih/QBM/2016/3/16/1574183610449920/1574183616806912/STEM/a4f997b195094fff85f770f26f63f82e.png)
(1)求证:BD∥CF;
(2)求证:H是AF的中点;
(3)连结CH,若HC⊥BD,求a:b的值.
![](https://img.xkw.com/dksih/QBM/2016/3/16/1574183610449920/1574183616806912/STEM/a4f997b195094fff85f770f26f63f82e.png)
(1)求证:BD∥CF;
(2)求证:H是AF的中点;
(3)连结CH,若HC⊥BD,求a:b的值.
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【推荐2】【概念学习】
如果四边形的一条对角线是其中两边的比例中项,则称这个四边形为“闪亮四边形”,这条对角线称为“亮线”,如图1,四边形
中,
满足
,四边形
是闪亮四边形,
是亮线.
【概念理解】
(1)菱形是闪亮四边形,则它的较小的一个内角是 °.
【概念应用】
(2)如图2,四边形
中,
,
, 判断哪一条线段是四边形
的亮线?请你作出判断并说明理由.
(3)如图3,
是闪亮四边形
的唯一亮线,
请求线段
的长.
如果四边形的一条对角线是其中两边的比例中项,则称这个四边形为“闪亮四边形”,这条对角线称为“亮线”,如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deef6f7135664425801f28e107eab53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae952ca0f954756faad04cb447c06f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
【概念理解】
(1)菱形是闪亮四边形,则它的较小的一个内角是 °.
【概念应用】
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e06f16fa2d417faed687617c2eecfdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffed7dd77a5e0745556b89036334ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48001497183e96bfb16ba4199716c3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c89fac8b35fe3f69906b30dc4ff403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/ae1887c7-51a4-413c-8865-9488ad67888e.jpg?resizew=370)
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解题方法
【推荐3】如图,在□ABCD中,∠ABD=90°,
,BD=8cm.点P从点A出发,沿折线AB—BC向终点C运动,点P在AB边、BC边上的运动速度分别为1cm/s、
cm/s.在点P的运动过程中,过点P作AB所在直线的垂线,交边AD或边CD于点Q,以PQ为一边作矩形PQMN,且QM=2PQ,MN与BD在PQ的同侧.设点P的运动时间为t(秒),矩形PQMN与□ABCD重叠部分的面积为S(cm2).
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912601634586624/2914127945998336/STEM/a5d4e950-5b15-4f41-a20f-9a7c9acc97ea.png?resizew=222)
(1)求边AB的长;
(2)当0<t<4时,PQ= ,当4<t<8时,PQ= (用含t的代数式表示);
(3)当点M落在BD上时,求t的值;
(4)当矩形PQMN与□ABCD重叠部分图形为四边形时,求S与t的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c3365b9a32ebc665837f86a371d6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912601634586624/2914127945998336/STEM/a5d4e950-5b15-4f41-a20f-9a7c9acc97ea.png?resizew=222)
(1)求边AB的长;
(2)当0<t<4时,PQ= ,当4<t<8时,PQ= (用含t的代数式表示);
(3)当点M落在BD上时,求t的值;
(4)当矩形PQMN与□ABCD重叠部分图形为四边形时,求S与t的函数关系式.
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【推荐1】折纸是富有趣味和有意义的一项活动,折纸中隐含着数学知识与思想方法.深入探究折纸,可以用数学的眼光发现,用数学的思维思考、用数学的语言描述,提升同学们的综合素养.
【操作发现】
(1)如图(1),在矩形
中,把矩形
折叠,使
与
重合,
与
重合,展平纸片得到折痕
,再第二次折叠,点
落在
上
点,展平纸片得到折痕
,连接
,
,则
等于
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
【深入探究】
(2)如图(2),
是矩形
边
上一点,把矩形折叠,使
与
重合,展平纸片得到折痕
;第二次折叠,点
落在
上的点
,
落在点
,展平纸片得到折痕
,连接
,
,
,写出
与
的数量关系,并给出证明;
【拓展应用】
(3)如图(3),正方形
中,
是射线
上一点,点
与点
是对称点,
是对称轴.点
与点
是对称点,
是对称轴,点
关于
的对称点为点
,连接
,
,
,
,当
时,直接写出
的长.
【操作发现】
(1)如图(1),在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc05172ee8b23cf1072e439b4470a728.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
【深入探究】
(2)如图(2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c733c8bb6ee8666dc5477d5fb8c6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2a174dbe7bb8c61f444d52e2a0620e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc07bb1b3855a0050ee0224e433f5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc05172ee8b23cf1072e439b4470a728.png)
【拓展应用】
(3)如图(3),正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c733c8bb6ee8666dc5477d5fb8c6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a155dcb1636ba8c34c5b0adef87461db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0e504e5dd95fea4ec276ee278889ed.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐2】如图,平面直角坐标系中,矩形
的对角线
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7f7af91a77685074840cfee7843b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/73658989-c93e-470c-938b-238e8c16d520.png?resizew=120)
(1)求B、C两点的坐标;
(2)把矩形沿直线DE对折使点C落在点A处,
与
相交于点F,求四边形
的面积;
(3)若点M在直线
上,平面内是否存在点N,使以O、F、M、N为顶点的四边形是菱形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7f7af91a77685074840cfee7843b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/73658989-c93e-470c-938b-238e8c16d520.png?resizew=120)
(1)求B、C两点的坐标;
(2)把矩形沿直线DE对折使点C落在点A处,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(3)若点M在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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