Question

Which transformation will always map a parallelogram onto itself?

Answer 1

Try a 180º rotation.

Answer 2

Well that only mirrors it to the diagonal quadrant. i would say 180 degrees --> flip over y-axis --> 90 degrees clockwise rotation.

(2, 3) --> (-3, -2) --> (-3, 2) --> ((2, 3)

Answer 3

There are probably other ways too, but this one works

Answer 4

Why did you rotate it around the origin?