Mathematics for IGCSE & O level - Transformations (Section 2 - No. 50)
If a figure is rotated 90 degrees counterclockwise, about the origin, what are the rules of the transformation?
(x,y) -> (y, -x)
(x,y) -> (-y, x)
(x,y) -> (-x, -y)
(x,y) -> (y, x)
설명
A 90-degree counterclockwise rotation transforms (x,y) to (-y,x).