Quadrilateral ABCD is transformed according to the rule open paren x comma y close paren rightarrow open paren y comma negative x close paren Which is another way to state the transformation?

A rotation about the origin by 90° clockwise sends (x, y) to (y, −x). A 90° clockwise rotation is equivalent to a 270° counterclockwise rotation, so the transformation is r about the origin by 270°. The correct choice is C.

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