材料:“八年级下册课本第187页例2:四边形
是一块正方形的土地,要在这块土地上修建两条笔直的、互相垂直的小路,把这块土地分成面积相等的四部分.你有哪些不同的方案?画出图形,并说明理由.”
小亮在学习了上述解决方案后,发现三种分割方案的图形都是中心对称图形.这对于他创作数学社团图标注入了灵感,经过思考,小亮设计了一个中心对称图形的社团图标,如图所示.已知O为正方形
的对称中心,
为
的直径,连接
,
.
(1)请你说明此图标是中心对称图形;
(2)若
,则
,
,
三者满足
.请证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/1dac1106-a02a-46fa-8164-f2754da2a093.png?resizew=524)
小亮在学习了上述解决方案后,发现三种分割方案的图形都是中心对称图形.这对于他创作数学社团图标注入了灵感,经过思考,小亮设计了一个中心对称图形的社团图标,如图所示.已知O为正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(1)请你说明此图标是中心对称图形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e0212491e4b2d7525de9a87fab3a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeda3a8c02ca9f6ba55148587d622b2c.png)
更新时间:2023-08-02 10:57:19
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知,直线
与反比例函数
交于点
,且点
的横坐标为4,过
轴上一点
作
垂直于
交
于
点,如图.
![](https://img.xkw.com/dksih/QBM/2019/8/28/2278366078205952/2278543949316096/STEM/4f84cb80bee045a0a935f8c997994974.png?resizew=454)
(1)若点
是线段
上一动点,过点
作
,
,垂足分别于
、
,求线段
长度的最小值.
(2)在(1)的
取得最小值的前提下,将
沿射线
平移,记平移后的三角形为
,当
时,在平面内存在点
,使得
、
、
、
四点构成平行四边形,这样的点
有几个?直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3080b9d9aaace24823a0fd8eb469e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bda45b7f565147f18a5c83bb8a23142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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![](https://img.xkw.com/dksih/QBM/2019/8/28/2278366078205952/2278543949316096/STEM/4f84cb80bee045a0a935f8c997994974.png?resizew=454)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70aa83794b41e477e7b546ecbe435ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edadd9995393ece0d7b7bf4801504bd.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/49b50357a6545cae8348e3059312f520.png)
(2)在(1)的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c4ed7451103f0cbf14bb9ae219b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1df19cb9318824552327c24ce8fb09b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7a1a06b9df3661ec1400e86819535a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efef9b7dcc3f2c27c47bb97ed54d72d7.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】定义:我们把对角线互相垂直的四边形叫做垂美四边形;性质:垂美四边形的对角线互相垂直.
,在四边形
中,接
,对角线相交于
,
垂直于
,问四边形
是垂美四边形吗?请说明理由;
(2)如图
,已知四边形
是垂美四边形,求证:
;
(3)如图
,分别以
的直角边
和斜边
为边向外作正方形
和正方形
,连接
,
,
,已知
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐1】已知:如图所示,正方形ABCD和正方形AEFG有一个公共点A,连接BE、DG.
线段BE、DG有怎样的关系?请证明你的结论.
线段BE、DG有怎样的关系?请证明你的结论.
![](https://img.xkw.com/dksih/QBM/2013/12/10/1573689920233472/1573689926565888/STEM/5658df6e8ced4cd7bf03a5cd8cbbf055.png)
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解答题-证明题
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名校
【推荐2】如图2,点在正方形
边
上,以
为对角线作正方形
,连接
,点
是线段
中点,连
,
,
.
(1)试判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
(2)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
①当,
,
三点共线时,
,
,求
的长;
②求证:.
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解答题-问答题
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适中
(0.65)
【推荐1】如图,△ABC与△DEF关于点O对称,请你写出两个三角形中的对称点,相等的线段,相等的角.
![](https://img.xkw.com/dksih/QBM/2015/3/2/1573803896373248/1573803902730240/STEM/5dd2a9ec6b76476a96d9d0a471765983.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在平面直角坐标系中,
三个顶点的坐标分别为
,
,
.
(1)将
经过平移得到
,若点
的对应点
的坐标为
,画出
,直接写出
,
的坐标
(______,______),
(______,______);
(2)画出与
关于原点
成中心对称的
;
(3)若
与
是中心对称图形.则对称中心的坐标为(______,______).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d8016002067726f1c74bcd923068b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c326ce6ff8dd53ff61eb34a41f10b7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97e0f5484c4853a8481ff4f8547f7a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/64c612c6-54db-43c0-bea0-761281cb0b16.png?resizew=273)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663d94efcc8a8a4b5a3563e94eb8fbb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
(2)画出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
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