如图,方格纸中每个小正方形的边长为
,
和
的顶点都在方格纸的格点上.
判断
和
是否相似,并说明理由;
以点
为中心,在位似中心的同侧画出
的一个位似
,使得它与
的相似比为
;
求
与
的面积比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0436efefa53aad714565ab2ba7ff90fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0436efefa53aad714565ab2ba7ff90fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c680d8e069da56e7f7229bc70648bd54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9df74deda968038e5a7e24901f642a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c680d8e069da56e7f7229bc70648bd54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6099c5d8df7335e6aaf41afa2f10dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9df74deda968038e5a7e24901f642a.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084766984511488/2136400173826048/STEM/bb859b11c274481187c48ae26483c2cd.png?resizew=243)
更新时间:2019-02-08 19:40:11
|
【知识点】 画已知图形放大或缩小n倍后的位似图形解读
相似题推荐
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在
的正方形网格中,每个小正方形的边长均为1,且每个小正方形的顶点称为格点,
的顶点均在格点上,按要求完成如下画图.(要求仅用无刻度的直尺,且保留必要的画图痕迹)
为边,画出
,使
与
全等,
为格点,请在图1中画出满足条件的所有
;
(2)在图2中,以点
为位似中心.画出
,使
与
位似,且位似比
,点
、
为格点;
(3)在图3中,在
边上找一个点
,且满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)在图2中,以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfb70809ed755c7f6d591a43394cac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)在图3中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b710d6f34af052d37a3ecd66551649a9.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图所示的平面直角坐标系中,
的三个顶点坐标分别为
,请按如下要求画图:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/165a1c65-5238-47bb-9667-87094bba0cac.png?resizew=230)
(1)
的面积为_______;(直接写出)
(2)画出
绕点原点O顺时针旋转
后得到的
;
(3)以坐标原点O为位似中心,在x轴下方,画出
的位似图形
,使它与
的位似比为
.
(4)
内部一点M的坐标为(a,b),则M在
中的对应点
的坐标为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747c238f5f79fa20424352ad98a2b0ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/165a1c65-5238-47bb-9667-87094bba0cac.png?resizew=230)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(3)以坐标原点O为位似中心,在x轴下方,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
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