Rotation formula RO,90° R_{O,90°} RO,90°
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(−y,x) (-y,x) (−y,x)
Rotation formula RO,180° R_{O,180°} RO,180°
(−x,−y) (-x,-y) (−x,−y)
Rotation formula RO,270° R_{O,270°} RO,270°
(y,−x) (y, -x) (y,−x)
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