如图,在直角坐标系中,点A的坐标为
,以线段
为边在第四象限内作等边
,点C为x轴正半轴上一动点(
),连接
,以线段
为边在第四象限内作等边
,直线
交y轴于点E.下列结论中错误 的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc09eb67cd8c8dde586441276877a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
A.![]() |
B.点E的位置不随着点C位置的变化而变化,点E的坐标是![]() |
C.将等边![]() ![]() ![]() |
D.当点C的坐标为![]() ![]() ![]() |
21-22八年级上·浙江杭州·期末 查看更多[4]
更新时间:2023-03-30 13:00:46
|
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【推荐2】如图,在菱形
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【推荐1】如图,在平面直角坐标系
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【推荐2】如图,在平面直角坐标系中,点
落在直线
上,过A点作x轴的垂线交直线
于点
,过
作
直线
交直线
于点
,过
点作x轴的垂线交直线
于点
,过
作
直线
交直线
于点
,线段
的长度是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/7aec19fc-99ca-4e64-9240-ccb90be159be.png?resizew=241)
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【推荐1】如图,等边
的边长为3,点
在边
上,
,线段
在边
上运动,
,有下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/76119a87-707f-44d4-9d2e-a89beb0b9fe6.png?resizew=121)
①
与
可能相等;②
与
可能相似;③四边形
面积的最大值为
;④四边形
周长的最小值为
.其中,正确结论的序号为( )
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①
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A.①④ | B.②④ | C.①③ | D.②③ |
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【推荐2】将等边
与等边
的顶点B重合,如图1放置,使D、E分别在
、
上,将等边
从图1位置开始绕点B顺时针旋转一周,如图2,直线
、
相交于点P.若:
,
.给出如下结论:在等边
旋转的过程中,①始终有
;②当点D落在
内部时,四边形
的面积为定值;③当点B到直线
的距离最大时,
;④当A、D、E三点共线时,
.上述结论中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/03756eeb-7d78-4e43-92bf-b61bc96eac81.png?resizew=323)
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A.1个 | B.2个 | C.3个 | D.4个 |
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