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The square whose vertices are O(0, 0), P(3, 0), Q(3, 3) and R(0, 3) is rotated through +90° to give an image whose vertices are O'(3, -1), P'(3, 2), Q'(0, 2) and R'(O, -1).
(a) Find the centre of rotation.
(b) If the square O'P'Q'R' is reflected in the line x = 0, find the co-ordinates of O"P"Q" and R".