Mathematics for IGCSE & O level - Transformations (Section 1 - No. 15)
What happens to the coordinates (x, y) after a 90-degree clockwise rotation about the origin?
(-x, -y)
(y, -x)
(-y, x)
(x, -y)
คำอธิบาย
90 degree clockwise (x, y) becomes (y, -x).