如图,在⊙O中,AB是⊙O的直径,OB=5,
,点E是点D关于AB的对称点,M是AB上的一动点,下列结论:①
的长度是
;②∠CED=
∠DOB;③DM⊥CE;④CM+DM的最小值是10,上述结论中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883422135181312/2886436156637184/STEM/f4e20ad6-2751-4cd5-9035-1f0d228b35d8.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/150ee7ccba61538d8bd7bddef1edd147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2daf8c9ca3b4a1695c4f47c1bf6c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883422135181312/2886436156637184/STEM/f4e20ad6-2751-4cd5-9035-1f0d228b35d8.png?resizew=162)
A.1个 | B.2个 | C.3个 | D.4个 |
21-22九年级上·浙江杭州·阶段练习 查看更多[3]
浙江省杭州市萧山区高桥初级中学2021-2022学年九年级上学期12月月考数学试题浙江省杭州市萧山区高桥初中教育集团2021-2022学年九年级12月学情调研数学试题 (已下线)第21课 弧、弦、圆心角、圆周角-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(人教版)
更新时间:2022-01-03 12:12:18
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【推荐1】如图,⊙O的半径为9cm,AB是弦,OC⊥AB于点C,将劣弧AB沿弦AB折叠交于OC的中点D,则AB的长为( )
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969147630166016/2970178775236608/STEM/faa0db89-c513-43eb-aa74-f9db2983505b.png?resizew=119)
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A.2![]() | B.3![]() | C.4![]() | D.6![]() |
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【推荐2】如图,A,B,C,D是⊙O上四点,
,∠E=30°,则∠DBE的度数是( )
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A.17.5° | B.22.4° | C.22.5° | D.23° |
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【推荐1】如图,
方格纸上的两条对称轴
相交于中心点O,对
分别作下列变换,其中,能将
与
重合,即点A与点
重合,点B与点
重合,点C与点
重合的是:( )
①先以点A为旋转中心顺时针旋转
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②先以点O为对称中心画出与
成中心对称的图形,再以点A的对应点为旋转中心逆时针旋转
;
③先以直线
为对称轴画出与
成轴对称的图形,然后向上平移4格,再以点A的对应点为旋转中心顺时针旋转
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①先以点A为旋转中心顺时针旋转
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②先以点O为对称中心画出与
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③先以直线
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A.①② | B.①③ | C.②③ | D.①②③ |
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【推荐2】如图,在
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