Question

Point A is located at (3,4) and is rotated 90 degrees counterclockwise about the origin. What is the new point of A?

Answer 1

A'(- 4, 3 )

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x )

A(3, 4 ) → A'(- 4, 3 )