1 . 《墨子·天文志》记载:“执规矩,以度天下之方圆.”度方知圆,感悟数学之美.如图,正方形
的边长为4,以它的对角线的交点为位似中心,作它的位似图形
,若
,则四边形
的外接圆半径为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff5a6318a8e8a0e8d06d4740b27681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
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5卷引用:2023年湖北省咸宁市中考三模数学试题
2 . 如图是由小正方形组成的网格,四边形
的顶点都在格点上,仅用无刻度的直尺在所给定的网格中按要求完成下列画图,画图过程用虚线表示,画图结果用实线表示.
为位似中心,将四边形
缩小为原来的
,画出缩小后的四边形
,再在
上画点
,使得
平分四边形
的周长;
(2)在图2中,先在
上画点
,使得
,再分别在
,
上画点
,
,使得四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad194a7c911eef46cf9a07eb4d6096f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在图2中,先在
![](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/d197ea8c1c8bbdf5edade431388eb713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7f709cd4bf123f329605b2f9ea679.png)
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3 . 如图,线段
两个端点的坐标分别为
,
,以原点
为位似中心,在第一象限内将线段
缩小为原来的
后得到线段
,则端点
的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48459fcff7af81f603f4a4311691c214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761c55c8988c9126a3a52e3041fa102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/ef0ffc06-ec30-4971-b175-f36ba0da5286.jpg?resizew=145)
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4 . 在平面直角坐标系中,已知
,
,连接
、
、
,以原点
为位似中心,位似比为
,把
缩小,则点
的对应点
的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4d581bf2e01294169f4d35b60febbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cfe8b9aebf9682d9fd3fa2290b6733a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
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5 . 如图,
与
位似,位似中心是点
,且
,若
的面积为5,则
的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/dc6445b4-577b-4d36-ad5d-6b1af4c26ec2.png?resizew=161)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e247d161a74abcdfefbc63bfeaa75a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/dc6445b4-577b-4d36-ad5d-6b1af4c26ec2.png?resizew=161)
A.10 | B.15 | C.20 | D.25 |
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名校
6 . 如图,在平面直角坐标系中,已知
,
与
位似,原点O是位似中心,且
,则点E的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02af485e17e7628fd5a3ace6e0a32ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30c90be34176f9308f10a57866cbd23.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 如图,矩形
与矩形
是位似图形,点O为位似中心,相似比为
,点B的坐标为
,则点E的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6714bc6120996ad930a0a37053480de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a74e1e7262edd5d4f415f20f12704a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
8 . 如图,
和
是以点O为位似中心的位似图形,
,
的周长为8,则
的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef70c209916bc856092fb1e5eea5480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/9221f9c9-a06d-4d4c-bc9b-a77faa3d58a8.png?resizew=138)
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9 . 在
中,点
,点
,O为坐标原点,以点O为位似中心,按相似比
把
放大,则点B的对应点
的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0d82cb174d173b7e36937c3f99f591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39794ff7cb1122d71aa1cd4548d8ae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
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10 . 在平面直角坐标系中,已知点
,
,
,以原点
为位似中心,相似比为
,把
缩小,则点
的对应点
的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a146b22c4a1c12b0349074fc8106d515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6711f23c2900c7b00a833bf21edb23d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542218ef7f8dab7c1ed8c89248c30616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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