Mathematics for IGCSE & O level - Transformations (Section 2 - No. 28)
If a point is rotated 270 degrees counterclockwise about the origin, what are the new coordinates?
(y, -x)
(-y, x)
(-x, -y)
(x, -y)
説明
270 degrees counterclockwise is equivalent to 90 degrees clockwise, which is (x, y) -> (y, -x)