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如图,阴影部分组成的图案既是关于x轴成轴对称的图形又是关于坐标原点O成中心对称的...
如图,阴影部分组成的图案既是关于x轴成轴对称的图形又是关于坐标原点O成中心对称的图形.若点A的坐标是(1,3),则点M和点N的坐标分别是( )
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A.M(1,-3),N(-1,-3)
B.M(-1,-3),N(-1,3)
C.M(-1,-3),N(1,-3)
D.M(-1,3),N(1,-3)
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如图,O是边长为1的正△ABC的中心,将△ABC绕点O逆时针方向旋转180°,得△A
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1与△ABC重叠部分(图中阴影部分)的面积为( )
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B.
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C.
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D.
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如图,△OAB绕点O逆时针旋转80°到△OCD的位置,已知∠AOB=45°,则∠AOD等于( )
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D.
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