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rectangle abcd is rotated 180°. what rule shows the input and output of the rotation, and what is the new coordinate of a′?

(x, y) → (−x, −y); a′ is at (5, −1)
(x, y) → (−y, x); a′ is at (−1, −5)
(x, y) → (y, −x); a′ is at (1, 5)
(x, y) → (x, −y); a′ is at (−5, −1)

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