单选题 较易0.85 引用3 组卷280
如图,两个半圆分别以P、Q为圆心,它们成中心对称,点A1,P,B1,B2,Q,A2在同一条直线上,则对称中心为( )
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020956171837440/3021891364528128/STEM/fc1ee9a296b5444bb5003f5093098337.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/2022/7/12/3020956171837440/3021891364528128/STEM/fc1ee9a296b5444bb5003f5093098337.png?resizew=227)
A.A2P的中点 | B.A1B2的中点 | C.A1Q的中点 | D.PQ的中点 |
20-21九年级上·黑龙江七台河·期中
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如图,在直角坐标系中,已知菱形OABC的顶点A(1,2),B(3,3).作菱形OABC关于y轴的对称图形OA′B′C′,再作图形OA′B′C′关于点O的中心对称图形OA″B″C″,则点C的对应点C″的坐标是( )
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228840928206848/2229049891291136/STEM/459f357810ec4399bc42a34bb89576de.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228840928206848/2229049891291136/STEM/459f357810ec4399bc42a34bb89576de.png?resizew=121)
A.(2,-1) | B.(1,-2) | C. (-2,1) | D. (-2,-1) |
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