顶点都在格点上的三角形称为格点三角形,如图.在方格纸中,格点三角形甲经过旋转后得到格点三角形乙,则其旋转中心是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/a54ad64f-25ff-472f-884e-8bbc0fc4b08d.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/a54ad64f-25ff-472f-884e-8bbc0fc4b08d.png?resizew=176)
A.格点E | B.格点F | C.格点M | D.格点N |
更新时间:2022-12-27 21:45:46
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【推荐1】如图,在Rt△ABC中,∠BAC=90°,将Rt△ABC绕点C按逆时针方向旋转46°得到Rt△A′B′C,点A在边B′C上,则∠ACB的大小为( )
![](https://img.xkw.com/dksih/QBM/2020/3/5/2413081634693120/2413828451549184/STEM/4350579103cd4ea29f737b9413111fc8.png?resizew=169)
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A.23° | B.44° | C.46° | D.54° |
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【推荐2】如图,将含有30°角的三角尺ABC(∠BAC=30°),以点A为中心,顺时针方向旋转,使得点C,A,B′在同一直线上,则旋转角的大小是( )
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865064141905920/2867229233610752/STEM/2b042ae9-e864-48c2-954b-e9642fd804d9.png?resizew=341)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865064141905920/2867229233610752/STEM/2b042ae9-e864-48c2-954b-e9642fd804d9.png?resizew=341)
A.30° | B.60° | C.120° | D.150° |
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【推荐1】在
中,
,
为对角线,将
绕点D逆时针旋转一定的角度后,得到
,使点A的对应点F落在边
上,若点B的对应点E落在边
的延长线上,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/9/71c375cd-3517-474a-8add-639639d9e370.png?resizew=132)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdda231b8f315e6a05982161dae2965.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,将△ABC绕点C顺时针旋转35°得到△DEC,边ED,AC相交于点F,若∠A=30°,则∠AFD的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/6e22b769-065d-4101-bfb8-673ca6d0d717.png?resizew=159)
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A.65° | B.15° | C.115° | D.75° |
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