Question

which of the following mapping is used for a 270-degree (counterclockwise) rotation?
A. (x,y) ---> (y,-x)
B. (x,y) ---> (-x, -y)
C. (x,y) ---> (-y, x)
D. (x,y) ---> (-y, -x)

Answer 1

For a 270-degree counterclockwise rotation, the mapping corresponds to (x, y) transformed to (y, -x).

The correct mapping is:
A. (x, y) ---> (y, -x)