Triangle RST was transformed using the rule (x, y) → (–x, –y). The vertices of the triangles are shown. R (1, 1) S (3, 1) T (1,
6) R' (–1, –1) S' (–3, –1) T' (–1, –6) Which best describes the transformation? The transformation was a 90° rotation about the origin. The transformation was a 180° rotation about the origin. The transformation was a 270° rotation about the origin. The transformation was a 360° rotation about the origin.
The transformation was a 180° rotation about the origin. Because, if we take formulas of rotation about the origin: X1=x*cos£+y*sin£. Y1=-x*sin£+y*cis£. And £=180° Than we recieve x1=-x y1=-y
