1 . 如图,在长方形纸片
中,
,
,将长方形纸片折叠,使点
落在
边的点
处,折痕为
,此时
.
(1)求
的值;
(2)在
边上是否存在一个动点
,且不与点
、
重合,使
的周长最小.如果存在求出
的周长最小值:如果不存在,请说明理由;
(3)若点
,
是
边上的两个动点,且不与点
,
重合,
.当四边形
的周长最小时,其周长的最小值是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcad23fd44f0c58d0def5a6ddf22e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb3465d2beda0240e452d25501316bd.png)
![](https://img.xkw.com/dksih/QBM/2020/11/10/2592786583642112/2607572504625152/STEM/ae4eb504-5376-443c-947f-649da94572cf.png)
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2 . 如图,在四边形
中,
,
,
,若
,
,则点
到
的距离是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/11/11/2590564564615168/2605359084453888/STEM/ede9fd48317141fe94381cd163b6f1de.png?resizew=190)
您最近一年使用:0次
2020-12-02更新
|
646次组卷
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3卷引用:江苏省南京市第二十九中学2020-2021学年八年级上学期期中数学试卷题
江苏省南京市第二十九中学2020-2021学年八年级上学期期中数学试卷题江苏省南京市联合体2020-2021学年第一学期八年级上数学期中考试试卷(已下线)专题14全等三角形-备战2021年中考数学核心考点清单(江苏专用)
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3 . 下表是小红填写的实践活动报告的部分内容,设铁塔顶端到地面的高度
为
,根据以上条件,可以列出的方程为 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f935c57deea934138d59bfa60bf8d86f.png)
题目 | 测量铁塔顶端到地面的高度 | |
测量目标示意图 |
|
|
相关数据 | ![]() |
A.![]() | B.![]() |
C.![]() | D.![]() |
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2020-11-27更新
|
463次组卷
|
6卷引用:河北省邢台市金华中学2020-2021学年九年级上学期期中数学试题
河北省邢台市金华中学2020-2021学年九年级上学期期中数学试题2021年江苏省扬州市江都实验中学中考数学三模试题(已下线)1.6 利用三角函数测高(重点练)-2020-2021学年九年级数学下册十分钟同步课堂专练(北师大版)(已下线)专题1.11 利用三角函数测高(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)河北省石家庄市第四十四中学2023-2024学年九年级上学期期中数学试题第1章 6 利用三角函数测高
4 . 在长方形
中,
,
,
是
边上一点,连接
,把
沿
折叠,使点
落在点
处,当
为直角三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d815a580f50aadfebaba48827d64fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2020/11/24/2599815327924224/2600760036040704/STEM/671a483bce4644348cae6fa7389017cf.png?resizew=163)
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5 . 如图,PA、PB分别与
相切于点A,B,点M在PB上,且OM
AP,MN⊥AP,垂足为点N.若
的半径R=3, PA=9,则OM的长是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2594836385193984/2597680557441024/STEM/56a28e8f9ba34a4fb62fd4b47d2fb391.png?resizew=110)
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2020-11-21更新
|
259次组卷
|
4卷引用:江苏省苏州市草桥中学校2020-2021学年九年级上学期期中数学试题
江苏省苏州市草桥中学校2020-2021学年九年级上学期期中数学试题江苏省苏州市姑苏区草桥中学2020-2021学年九年级上学期期中考试数学试卷(已下线)专题21与圆有关的位置关系-备战2021年中考数学考点 核心考点清单(江苏专用)(已下线)期中检测卷(中)-2021-2022学年苏科版九年级数学上册同步单元检测
6 . 如图,在Rt△ABC中,∠C=90°,AC=BC,点O在AB上,经过点A的⊙O与BC相切于点D,交AB于点E,若
,则图中阴影部分面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321f96c4f808afe67cf565ca74ae0351.png)
![](https://img.xkw.com/dksih/QBM/2020/11/7/2588023736279040/2594770034335744/STEM/aa51527f17dc4a179f4f9df80cae3588.png?resizew=104)
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7 . 如图,在矩形ABCD中,AD=
AB,∠BAD的平分线交BC于点E,DH⊥AE于点H,连接BH并延长交CD于点F,连接DE交BF于点O,证明下列结论:①∠AED=∠CED ②△ABE≌△AHD ③HF=AB ④H是BF中点 ⑤BC-CF=2HE.其中正确的结论有____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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8 . 如图,以矩形ABCD对角线BD上一点O为圆心作⊙O过A点并与CD切于E点,若CD=3,BC=5,则⊙O的半径为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8db76ed1-2490-4710-ba90-f5c8528746ef.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8db76ed1-2490-4710-ba90-f5c8528746ef.png?resizew=211)
A.![]() | B.3 | C.![]() | D.![]() |
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9 . 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)
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10 . 把球放在长方体纸盒内,球的一部分露出盒外,其截面如图所示,已知EF=CD=12cm,则球的半径为______ cm.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/a6db6bff-f507-47f5-8382-2edb4f5245ab.jpg?resizew=134)
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2020-11-17更新
|
333次组卷
|
2卷引用:江苏省无锡市东林中学教育集团2020-2021学年九年级上学期期中数学试题