Rotation of 90 Degrees Counterclockwise
How to solve the rotation of 90 degrees counterclockwise problems: formula, example, and its solution.
The image of a point (x, y),
whose image is under a rotation of 90 degrees
counterclockwise about the origin,
is (-y, x).
Rotation of 90º counterclockwise:
(x, y) → (-y, x)