如图,在平面直角坐标系
中,点A的坐标为
,以
为边在x轴上方作等边三角形
,作点A关于直线
的对称点C,则点C的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfa2a6d9749a619edf80bad8b3e4962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/13bd8cbb-d02d-4468-ba82-6e22be3b3cd5.png?resizew=145)
更新时间:2024-03-16 16:14:51
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【推荐1】已知等边
中,点
、
分别在边
、
上,把
沿直线
翻折,使点
落在点
处,
、
分别交边
于点
、
,若
,则
的度数为__________ .
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【推荐2】如图1.在平面内取一定点O,引一条射线Ox,再取定一个长度单位,那么平面上任一点M的位置可由
的长度m与
的度数α确定,有序数对(m,α)称为M点的极坐标,这样建的坐标系称为极坐标系,如图2,在极坐标系下,有一个等边三角形
,则点B的极坐标为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
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【推荐1】如图,点P为弦AB上的一点,连接OP,过点P作PC⊥OP,PC交☉O于C.若AP=8,PB=2,则PC的长是___
![](https://img.xkw.com/dksih/QBM/2019/4/22/2187754597302272/2190190905286657/STEM/fd2a00dd595f4bb1bb9b045b4a3b0856.png?resizew=133)
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【推荐2】在南宋数学家秦九韶所著的《数书九章》第二章“天时类”中,收录了四个有关测量降水量的例子,分别是“天池测雨”、“圆罂测雨”、“峻积验雪”和“竹器验雪”.其中的“峻积验雪”,就是根据一定尺寸的斜面上积雪的厚度,推算平地上积雪的厚度,其原理为:如图,在
中,
,
,
,
,
,过点
作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
交
的延长线于点
,过点
作
交
于点
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2cad78743c99f9b670c373d14446ad.png)
_____ .
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【推荐1】已知点
关于y轴的对称点Q的坐标是
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4753f4a4456d0df13843b71015bfa14.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb140a01b243139e16602346abc5f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bbccb1995df4ec7357c35001780df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4753f4a4456d0df13843b71015bfa14.png)
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【推荐2】点A(a,b)和点B关于x轴对称,而点B与点C(2,3)关于y轴对称,那么a=__ ,b=__ ,点A和点C的位置关系是__ .
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