Quadrilateral ABCD is transformed according to the rule (x, y) → (y, –x). Which is another way to state the transformation?

A rotation about the origin sends (x, y) to (y, −x) when it turns points 90° clockwise. A clockwise 90° turn is the same as a counterclockwise 270° turn, so the transformation is R₀, 270° (choice C).

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