6. If AB is rotated 180° clockwise about a point not on the line AB then which of the following statements
about its image, A'B', is true?
(1) AB and A'B' have the same length and are perpendicular
(2) AB and A'B' have different lengths and are perpendicular
(3) AB and A'B' have the same length and are parallel
(4) AB and A' B' have different lengths and are parallel