1 . 如图,为一圆洞门.工匠在建造过程中需要一根横梁AB和两根对称的立柱CE、DF来支撑,点A、B、C、D在⊙O上,CE⊥AB于E,DF⊥AB于F,且AB=2
,EF=
,
=120°.
(1)求出圆洞门⊙O的半径;
(2)求立柱CE的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb16d1089cf194d658387742e1c2a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(1)求出圆洞门⊙O的半径;
(2)求立柱CE的长度.
![](https://img.xkw.com/dksih/QBM/2019/3/8/2156095963799552/2161657154174976/STEM/4385d867f4a64ecea2537e4988e38e55.png?resizew=113)
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2018-11-03更新
|
435次组卷
|
4卷引用:2019届九年级人教版上册 第24章 圆 单元测试卷
名校
2 . 如图,矩形ABCD中,AB=2BC,在CD上取一点E,使AE=AB,延长AE与BC延长线交于点F,则FC:FB=_____ .
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084790117515264/2089782629908480/STEM/01d0a943499b4114a6867bc4f75d93b6.png?resizew=123)
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2018-11-02更新
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5卷引用:2019届九年级沪科版上册第22章相似形单元检测数学试题
2019届九年级沪科版上册第22章相似形单元检测数学试题人教版九年级数学下册第 27 章《相似》单元测试题人教版九年级数学下册 第 二十七 章《相似》重点题型专题测试卷(已下线)第22章 相似性 单元检测(2)-2020-2021学年九年级数学上册十分钟同步课堂专练(沪科版)【全国百强校】重庆市渝中区巴蜀中学2019届九年级(上)开学数学试卷
3 . 如图,在矩形
中,
,
,点
、
、
、
分别在矩形
的各边上,
,
,则四边形
的周长是( )
![](https://img.xkw.com/dksih/QBM/2018/10/29/2064289262215168/2064577828560896/STEM/7f040e119b564777aefeb0035aecb351.png?resizew=98)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19467183b692069a6023814937e61541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f72a465d7f29e769836c7ab9c24086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://img.xkw.com/dksih/QBM/2018/10/29/2064289262215168/2064577828560896/STEM/7f040e119b564777aefeb0035aecb351.png?resizew=98)
A.![]() | B.![]() | C.![]() | D.![]() |
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2018-10-30更新
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6卷引用:浙教版2019届九年级数学上册_第四章_相似三角形_单元检测试卷_
4 . 如图,矩形
中,
于
,点
恰好是
的中点,
,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf378ee80a45789b13d3c67e17329353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac943d8c2eb91c0082ada87857d1ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://img.xkw.com/dksih/QBM/2018/9/12/2030699008368640/2036664909430785/STEM/2e4c2bc80906418986ef57a321860d94.png?resizew=112)
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名校
5 . 如图所示,点
是正方形
的对角线
上一点,
于
,
于
,连接
,给出下列四个结论:
①
; ②
一定是等腰三角形; ③
; ④
,
其中正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb8d58e0ddb759c7c5ea800b371b017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e24ce1126ee700c08f82189bde0441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64cbcffe631d8354227ce3b40dc9244d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc0ce5eed6eeba02618f17d5b306bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c76dcb10d5975e5cec61d4e10127fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b072a814f26b94a3761c65ee970b5ce.png)
其中正确结论的序号是
![](https://img.xkw.com/dksih/QBM/2018/9/10/2029165225705472/2035914601201664/STEM/51085ae329384bad9806fd1aa73634f3.png?resizew=99)
您最近一年使用:0次
2018-09-30更新
|
749次组卷
|
4卷引用:山东省青岛4中2018-2019学年度第一学期北师大版九年级数学上册第一章特殊平行四边形单元测试题
6 . 如图,在
中,
,
,
,
是斜边
上一动点,
于
,
于
,
与
相交于点
,则
的最小值为( )
![](https://img.xkw.com/dksih/QBM/2018/9/18/2034930894159872/2035990276300800/STEM/070e8b3b8ac54ac3b79dce5f37b88f9e.png?resizew=122)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4457aacb176adef9b80531504abc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd84de828fe646996ba099b6ecf14a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98a371feb52b70a7ba91d9e70177601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e2217180dd12a4e385d0ee9ded6c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c72171ccd9796fbb7b493a2d927a39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5487772d40332b016708af86987b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c59076e80b15755ef630fd5f40d1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f9d231d68ba624378dde26a8603c3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24785a7517796d9d56623914c4407046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d1e8c42e1ad201337c1a40d29bac3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b2a8c80bc574fc27cb32dcb06c6679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc44bdb6fe6bcc0190f26ae24779e068.png)
![](https://img.xkw.com/dksih/QBM/2018/9/18/2034930894159872/2035990276300800/STEM/070e8b3b8ac54ac3b79dce5f37b88f9e.png?resizew=122)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 如图,矩形
中,
的平分线交
于
.若
,
,则
( )
![](https://img.xkw.com/dksih/QBM/2018/9/17/2034238854283264/2036513940619264/STEM/252e597d-64a1-4bba-a0c5-9c6775ceba36.png?resizew=177)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78623b947fa3654bf70a7b45036f9199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b2507f4fd433e2f807e2547ae14b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7babea9725f1c14b213b05f603b8251b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df9614b83d62d312edb810429a4d1188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f30f89b3abfa3a46d799a33bc20b9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02068981d0db1e034905b710c6b36ce2.png)
![](https://img.xkw.com/dksih/QBM/2018/9/17/2034238854283264/2036513940619264/STEM/252e597d-64a1-4bba-a0c5-9c6775ceba36.png?resizew=177)
A.6 | B.7 | C.8 | D.11 |
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8 . 如图,在长方形
中,
,线段
上有动点
,过
作直线
交
边于点
,并使得
.
(1)当
与
重合时,求
的长;
(2)在直线
上是否存在一点
,使得
是等腰直角三角形?若存在,求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94aad4c2109f60fcbf5488a545b16c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a977acbd46f8e7a28869ac3b86fe18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3be72f3f0fc7f5c03660519f18a304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8346ced59eb87a592fca47a82a146912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161bbfc6570bf67ede88b0271ac63057.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8346ced59eb87a592fca47a82a146912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6580124c273452a2ab0fb0469d9e3e.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf64643144ce16930bd20cb438b999a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5de7169a7ffc7db3e5009349810a863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a946fb26d837cd9255f41531f2b27e4d.png)
![](https://img.xkw.com/dksih/QBM/2018/9/15/2033117086400512/2036337194434560/STEM/c533071d15df4138bd4814441ad6d511.png?resizew=288)
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9 . 如图所示,
为矩形
的对角线的交点,
,
.
试判断四边形
的形状,并说明理由;
若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2027dcd14ca4e728764d8591f7808920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c7627098648cc143485fc4879accb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bee93483c7cb59eba2b676087ee6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77847ba0afc18466b17cea483eb29cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6e17b7a9d3cf87161512785cb65ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bee93483c7cb59eba2b676087ee6a5.png)
![](https://img.xkw.com/dksih/QBM/2018/9/9/2028841003368448/2036198795730944/STEM/c986117d4f94405886061b1716538444.png?resizew=144)
您最近一年使用:0次
2018-09-20更新
|
118次组卷
|
2卷引用:山东省青岛开发区实验初中2019届九年级北师大版数学上_第一章_特殊平行四边形_单元检测题
10 . 在矩形
中,
,
,
是
上一动点,
于
,
于
,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2018/9/9/2028885238218752/2036198635970560/STEM/9c65eaec906d4733ae0d4cbccd117295.png?resizew=137)
![](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/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97136ba3d3ffd4c48a50d69ea502d707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://img.xkw.com/dksih/QBM/2018/9/9/2028885238218752/2036198635970560/STEM/9c65eaec906d4733ae0d4cbccd117295.png?resizew=137)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-09-20更新
|
201次组卷
|
5卷引用:山东省青岛市开发区实验初中2018-2019学年度第一学期北师大版九年级数学上册_第一章_特殊平行四边形_单元评估检测