Question

A graph shows the points A (4, 1), B (4, -1), C (1, -4), D (-1, -4), E (-4, -1), F (1, -4), G (-1, 4), and H (1, 4) in an octagon-like shape due to the positions of the points.
Point A is the original point before rotating. Which point represents A' after A is rotated 90 degrees counterclockwise?

Answer 1

A' is G. Rotation 90° counterclockwise sends (x,y) to (−y,x), so (4,1) → (−1,4), which is point G.