某数学课外兴趣小组成员在研究下面三个有联系 的问题,请你帮助他们解决:
(1)如图1,矩形ABCD中,AB=8,BC=6,将矩形对折,使得点B、点D重叠,折痕为EF,过点F作AB的垂线交AB于点G,求EF的长;
(2)如图2,矩形ABCD中,AB=a,BC=b,点E,F分别在AB,DC上,点G,H分别在AD,BC上且EF⊥GH,求
的值;
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=8,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
的值.
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589307275059200/2594726952288256/STEM/dfdc1a109cb1420085c97666591b3293.png?resizew=476)
(1)如图1,矩形ABCD中,AB=8,BC=6,将矩形对折,使得点B、点D重叠,折痕为EF,过点F作AB的垂线交AB于点G,求EF的长;
(2)如图2,矩形ABCD中,AB=a,BC=b,点E,F分别在AB,DC上,点G,H分别在AD,BC上且EF⊥GH,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d12504c6da5f94ba2656ca727c2fe82.png)
(3)如图3,四边形ABCD中,∠ABC=90°,AB=AD=8,BC=CD=4,AM⊥DN,点M,N分别在边BC,AB上,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f710f8f1fa0df203765d18692ded6a91.png)
20-21九年级上·江苏无锡·期中 查看更多[3]
更新时间:2020-11-17 08:48:24
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【推荐1】如图,正方形ODEF的边OD、OF在坐标轴上,点E坐标为(﹣6,6),将正方形ODEF绕点D逆时针旋转角度(0°<
<90°),得到正方形ABCD,AB交线段OF于点P,BA的延长线交线段EF于点Q,连DP、DQ
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/1418c5c7-de85-427d-95a2-e1c184f980d5.png?resizew=186)
(1)求证:△ADQ≌△EDQ;
(2)求∠PDQ的度数;并判断线段PQ、EQ、PO之间的数量关系,说明理由.
(3)连接AF、FB、OB、AO得到四边形AFBO,在旋转过程中,当P点在何位置时四边形AFBO是矩形?请说明理由,并求出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/1418c5c7-de85-427d-95a2-e1c184f980d5.png?resizew=186)
(1)求证:△ADQ≌△EDQ;
(2)求∠PDQ的度数;并判断线段PQ、EQ、PO之间的数量关系,说明理由.
(3)连接AF、FB、OB、AO得到四边形AFBO,在旋转过程中,当P点在何位置时四边形AFBO是矩形?请说明理由,并求出点Q的坐标.
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【推荐2】如图,在平面直角坐标系中,矩形
的边
在x轴上,边
在y轴上,且B点坐标为
.动点M、N分别从点O、B同时出发,以1单位/秒的速度运动(点M沿
向终点A运动,点N沿
向终点C运动),过点N作
交
于点P,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/c485fed1-6f76-46ea-8b7b-6d8a48cf8a0d.png?resizew=318)
(1)直接写出
的长度;
(2)在运动过程中,请求出
的面积S与运动时间t的函数关系式;
(3)在运动过程中,
的面积S是否存在最大值?若存在,请求出当t为何值时有最大值,并求出最大值;若不存在,请说明理由.
(4)在运动过程中,以点A,P,M为顶点的三角形与
能相似吗?若能相似,请求出运动时间t的值;若不能相似,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4bbb2e220a7eeac8218712558d3637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a39d6ce9d0576637f71302448751076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/c485fed1-6f76-46ea-8b7b-6d8a48cf8a0d.png?resizew=318)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b03a0c8b7c3b7af9dce15e3a647541.png)
(2)在运动过程中,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae6906b2770efd77e89c396ff3dd336.png)
(3)在运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae6906b2770efd77e89c396ff3dd336.png)
(4)在运动过程中,以点A,P,M为顶点的三角形与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
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【推荐1】点E在正方形ABCD的边BC上,点F在AE上,连接FB,FD,∠ABF=∠AFB.
(1)如图1,求证:∠AFD=∠ADF;
(2)如图2,过点F作垂线交AB于G,交DC的延长线于H,求证:DH=2 AG;
(3)在(2)的条件下,若EF=2,CH=3,求EC的长.
(1)如图1,求证:∠AFD=∠ADF;
(2)如图2,过点F作垂线交AB于G,交DC的延长线于H,求证:DH=2 AG;
(3)在(2)的条件下,若EF=2,CH=3,求EC的长.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584956418506752/2589883637612544/STEM/4cfdf804176f401c900e36d48beffe2d.png?resizew=421)
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【推荐2】平行四边形
中,点
为
上一点,连接
交对角线
于点
,点
为
上一点,
于
,
且
,点
为
的中点,连接
;若
.
(1)求
的度数;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23393d953a5bcb37b595caba358f34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce0525b99773983a883c3cccf4998cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652a9752a729bcc2bd80d6e32c8ba88d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354b5b53b34f8c06af3910c1189a3efd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/79ed240a-d317-4fdb-a52d-6af146cfee38.png?resizew=224)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd4f0048b27e6fb7d233c05011b5b1f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae58ebe8b458324bf5d1539edc2f1cdb.png)
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【推荐3】(1)【问题提出】如图①,点A为线段BC外一动点,且BC=a,AB=b,则线段AC的最大值为 ;(用含a,b的式子表示)
(2)【问题探究】如图②,点A为线段BC外一动点,且BC=6,AB=3,分别以AB,AC为边,作等边三角形ABD和等边三角形ACE,连接CD,BE,找出图中与BE相等的线段,请说明理由,并求出线段BE长的最大值;
(3)【问题解决】如图③,某市区有一块空地,为了美化环境,计划设计一个不规则的四边形景观区域ABCD.根据实际情况,要求AB=AD,∠BAD=60°,且对角线BD⊥CD于点D,为尽量增加游客观赏时间、提高观赏体验感,计划在景观区域内部沿对角线AC修一条小道.已知BC=40m,求AC的最大值.
(2)【问题探究】如图②,点A为线段BC外一动点,且BC=6,AB=3,分别以AB,AC为边,作等边三角形ABD和等边三角形ACE,连接CD,BE,找出图中与BE相等的线段,请说明理由,并求出线段BE长的最大值;
(3)【问题解决】如图③,某市区有一块空地,为了美化环境,计划设计一个不规则的四边形景观区域ABCD.根据实际情况,要求AB=AD,∠BAD=60°,且对角线BD⊥CD于点D,为尽量增加游客观赏时间、提高观赏体验感,计划在景观区域内部沿对角线AC修一条小道.已知BC=40m,求AC的最大值.
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951001316286464/2952918155575296/STEM/0c9e8103-d5a6-43e0-9a99-40ec0c08088f.png?resizew=476)
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【推荐1】如图,AB是⊙O的直径,C、G是⊙O上两点,且C是弧AG的中点,过点C的直线CD⊥BG的延长线于点D,交BA的延长线于点E,连接BC,交OD于点F.
(1)求证:CD是⊙O的切线;
(2)若
,求证:AE=AO;
(3)连接AD,在(2)的条件下,若CD=2
,求AD的长.
(1)求证:CD是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c769a7c7e4aa5bcc9425daeb45eabc8.png)
(3)连接AD,在(2)的条件下,若CD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/5/28/2213267559768064/2213608614002688/STEM/7df3bf6ca4ae4b328079e9423620cfee.png?resizew=214)
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【推荐2】已知:在正方形
的边
上任取一点
,连接
,一条与
垂直的直线
(垂足为点
)沿
方向,从点
开始向下平移,交边
于点
.
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762851254665216/2762869305352192/STEM/79add0c7-f9bd-4f26-af2b-4cc7c742e757.png)
(1)当直线
经过正方形
的顶点
时,如图1所示.求证:
;
(2)当直线
经过
的中点时,与对角线
交于点
,连接
,如图2所示.求
的度数;
(3)直线
继续向下平移,当点
恰好落在对角线
上时,交边
于点
,如图3所示.设
,求
与
之间的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762851254665216/2762869305352192/STEM/79add0c7-f9bd-4f26-af2b-4cc7c742e757.png)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ce0398a9077dc619224669fbaea41c.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13482e7e6e0d09413c59ef5f55230b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐3】【问题提出】
(1)如图①,正方形
的对角线相交于点
,则
的度数是 °;
【问题探究】
(2)如图②,在
中,
,
,点
为边
上的点,点
、
分别在边
、
上,连接
、
,
,点
为
上一点,且
,求证:
;
【问题解决】
(3)如图③,某地拟建造一个形如四边形
的露营基地,其中
,
.为考虑露营客人娱乐休闲的需求,在四边形
区域中,计划沿线段
修建隔离防护栏,将三角形
区域设立成花卉观赏区,三角形
区域设立成烧烤区,根据设计要求,点
在线段
上,点
、
分别在线段
、
上,且
,其中
,
米,求烧烤区三角形
的面积.
(1)如图①,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
【问题探究】
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ba2098ed6b4137b08932524b72ba37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddef81e3af08a62a69bc3e56a940bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea97121b055fd98ad82d508ea8eb5c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebafa3eaadfa1f8b85175216fc29c96f.png)
【问题解决】
(3)如图③,某地拟建造一个形如四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f6d1d3cef9f5a9e0a67b106d669854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963570b96967a610195235fe40afbaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513ca48b602a2287942b6380ff4cb250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe767a2605eaecf67dfe02df04d864e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/a5008467-736f-4725-be7a-85e5f3c3d7ea.png?resizew=483)
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