1 . 如图9.1,在△ABC中,∠BAC=90°,点D为AB边上的一点,过点D作DE⊥BC于E,连接CD,过点A作AF∥DE交CD于点F,交BC于点G,连接EF.
(1)求证:△BED∽△BAC;
(2)写出所有与△BED相似的三角形(△BAC除外);
(3)如图9.2,若四边形ADEF是菱形,连接对角线AE与DF相交于点O.
①求证:OA2=OC·OF;
②当AE=12,CF=5时,求OF的长,并直接写出△BED与△BAC的相似比的值.
![](https://img.xkw.com/dksih/QBM/2017/9/7/1769084367642624/1769346057576448/STEM/4876ae1f7a204b358ad87f6118220fcb.png?resizew=493)
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10-11八年级上·海南海口·期中
真题
2 . 如图,在□ABCD中,AE=EB,AF=2,则FC等于_____ .
![](https://img.xkw.com/dksih/QBM/2015/2/10/1573799527391232/1573799532978176/STEM/b6debd6c-6aae-4c6f-9599-e0d5a35f3454.png)
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2016-12-05更新
|
504次组卷
|
5卷引用:2010年海南省海口市初二第一学期期中数学卷
(已下线)2010年海南省海口市初二第一学期期中数学卷(已下线)2010年高级中等学校招生考试数学卷(福建宁德)2015届湖南省娄底市九年级上学期期末考试数学试卷山东省安丘经济开发区中学2014-2015学年上学期北师大版九年级数学上册《第四章 图形的相似》单元测试(已下线)人教版九年级 27.2 平行线分线段成比例定理
3 . 如图,将矩形纸片ABCD沿AE折叠,使点B落在对角线AC上的点F处,再沿EG折叠,使点C落在矩形内的点H处,且E、F、H在同一直线上,若
,
,则CG的长是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/76926b9d-781f-45ae-939b-6facf90a5846.png?resizew=132)
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4 . 如图5, 在△ABC中,AB=8,AC=5,M是AC边上的一点,AM=2, 在AB边上取一点N,使以A、M、N为顶点的三角形与△ABC相似,则AN的长为__________ .
![](https://img.xkw.com/dksih/QBM/2017/9/7/1769084367642624/1769346057469952/STEM/2bfbf441fc7849a8acfd9486bd2b033d.png?resizew=230)
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2017-09-08更新
|
357次组卷
|
2卷引用:海南省海口市龙华区第六学区2017届九年级上学期期中检测数学试题
5 . 如图,已知抛物线
与x轴交于点
和点B,与y轴交于点C,抛物线的对称轴交x轴于点
,过点B作直线
轴,过点D作
,交直线l于点E.
(2)点P为第三象限内抛物线上的点,作直线
交
于点Q.
①连接
,若
轴,求
的面积;
②当
时,求点P的坐标;
(3)在(2)②中
的条件下,连接
,在直线
上是否存在点F,使
,若存在,请直接写出点F的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c22804f52986009170586c673342d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc2bc36d12cfb0207adb98810f46321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165a501b2e6a3acc46212e59a166c053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e41916523511064a97de39b0f2b323.png)
(2)点P为第三象限内抛物线上的点,作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0215fcd72572bb524eca8a7fdc3f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400b65129b3828c7e26f2e9f864a219c.png)
(3)在(2)②中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400b65129b3828c7e26f2e9f864a219c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a3b928ac1a6786854845376640716a.png)
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11-12九年级上·海南海口·期末
6 . 如图,在△ABC中,DE∥BC,BC=6,梯形DBCE面积是△ADE面积的3倍,则DE=________ .
![](https://img.xkw.com/dksih/QBM/2018/1/22/1865784405090304/1866729218138112/STEM/dcde409953fa400a84052370bf7fb123.png?resizew=157)
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2016-12-05更新
|
945次组卷
|
3卷引用:2010—2011学年海南省海口市九年级第一学期期末数学试卷
(已下线)2010—2011学年海南省海口市九年级第一学期期末数学试卷2017—2018学年度第一学期海南省海口市九中九年级数学科期末检测题河南省南阳市唐河县2018-2019学年九年级上学期期中数学试题
7 . 在平面直角坐标系中,
是坐标原点,
的顶点
的坐标为
,
,点
的坐标为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
,点
在
轴的正半轴上,点
为线段
的中点.
(1)如图1,求
的大小及线段
的长;
(2)过点
的直线
与
轴交于点
,与射线
交于点
.连接
,
是
关于直线
对称的图形,记直线
与射线
的交点为
,
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
.
①如图
,当点
在点
的左侧时,求
,
的长;
②当点
在点
的右侧时,求点
的坐标
直接写出结果即可
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526d1ee3cc2e405477264c9cc4d03b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1158b401ca717391b6474d457721a6fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc917f8dd29f5a5fcf4762052bb8fa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b913a38cbf10653da2a802900899acc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672d8ec28e6ce2100497396aad52b19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303d70e1200abd2156b3a87bcc4bd5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329d62100c4ab77ee1df7f8d05e366db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/916c7169-b534-4637-8fa1-88cca4985b26.png?resizew=471)
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2017-07-23更新
|
110次组卷
|
5卷引用:海南临高县创新学校 2017年九年级数学中考模拟试卷
12-13九年级上·北京·期中
8 . 在平面直角坐标系xOy中,抛物线y=x2+bx+c与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,点B的坐标为(3,0),将直线y=﹣x沿y轴向上平移3个单位长度后恰好经过B,C两点.
(1)求抛物线的解析式;
(2)设抛物线的顶点为D,点P在抛物线的对称轴上,且∠APD=∠ACB,求点P的坐标;
(3)连结CD,求∠OCA与∠OCD两角和的度数.
(1)求抛物线的解析式;
(2)设抛物线的顶点为D,点P在抛物线的对称轴上,且∠APD=∠ACB,求点P的坐标;
(3)连结CD,求∠OCA与∠OCD两角和的度数.
![](https://img.xkw.com/dksih/QBM/2016/10/10/1574246198026240/1574246204039168/STEM/12edb7f98fde47e2a8c25b17dde7f499.png)
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9 . 如图1,正方形
中,
,
是
边的中点,点
是正方形内一动点,
,连接
,过点
在
的右侧作
,且
,连接
、
.
;
(2)当
时,求
的长;
(3)如图2,若
三点共线,求点
到直线
的距离;
(4)直接写出线段
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af9774200946261f0ccba3e6eeba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f501137809dba21dfab7dd56f68f7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01bf1398c93b6f14c016cf4ccc39b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89585c18e76317e295b877c25bfef451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(4)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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名校
10 . 如图1,在矩形
中,点M是
的中点,点E是边
上一动点,连接
,并延长交射线
于点F,过点M作
的垂线交射线
于点G,连接
和
.
①
;
②
;
(2)在点E的运动过程中,探究:
①若矩形
是正方形,则
的值是否发生变化?若不变,求出这个值;
②如图2,若
,
,
,当
为等边三角形时,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f30cb81835298cb612a828f355060a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8b62dc033d86ee9e561b8903796701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6edcd776eb1edbbe5570ff8a88dfe469.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9da441d03aaaf554fe33d3bf8952331.png)
(2)在点E的运动过程中,探究:
①若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f3302029f1c192a9314ee4c2592547.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9b29f02b493e55038527a487711aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e95aa27511bf7b9203025aa3243565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
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