如图,四边形AOBC是正方形,曲线CP1P2P3⋅⋅⋅叫做“正方形的渐开线”,其中弧CP1,弧P1P2,弧P2P3,弧P3P4的圆心依次按点A,O,B,C循环,点A的坐标为(2,0),按此规律进行下去,则点P2021的坐标为 _____ .
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875621661786112/2876125890437120/STEM/430a84d4-592c-421e-9ac6-4de5aa24607d.png?resizew=178)
2021·广东梅州·二模 查看更多[4]
2021年广东省梅州市初中学生水平考试数学模拟试题山东省潍坊市寿光市2021-2022学年九年级上学期期中数学试题(已下线)专题1.18 直角坐标系背景下的特殊平行四边形(基础篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)福建省漳州市第一中学芝山校区2023-2024学年度八年级上学期第三次月考数学试题
更新时间:2021-12-19 22:36:00
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【推荐1】如图.已知直线
,过点
作x轴的垂线交直线l于点N,
,过点N作直线l的垂线交x轴于点
;过点
作x轴的垂线交直线l于点
,过点
作直线l的垂线交x轴于点
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的坐标为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3016baf1a9ce777f16ea9ce469b2510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c9dcfd9f4c5298035870cb88a34169.png)
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【推荐2】在平面直角坐标系中,对于平面内任一点
,若规定以下两种变换:
(1)
.如:
;
(2)
.如:
;
按照以上变换有:
,那么
等于_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af475c713e8397ec04bf17c34e33ab74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67fc49a64defa9e30c22e6ed9c7526f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9514f93f782402f7986a3aaa73f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc1410553276cef7a9eb7ba839106f3.png)
按照以上变换有:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28037c6ad13f6c001ad8e3597740ac94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d3411322ba4f0457bd7d252ddaa2ed.png)
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【推荐1】正方形
,
,
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【推荐2】如图,在边长为2的正方形ABCD中,点E是边AD中点,点F在边CD上,且FE⊥BE,设BD与EF交于点G,则△DEG的面积是___
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