Question

A pentagon is transformed according to the rule R0, 180°. Which is another way to state the transformation?

(x, y) → (–x, –y)
(x, y) → (–y –x)
(x, y) → (x, –y)
(x, y) → (–x, y)

Answer 1

(x, y) → (−x, −y)

A 180° rotation about the origin sends every point (x,y) to its opposite point through the origin, which is (−x,−y).