Given:
ABCD is a parallelogram
Diagonals AC and BD intersect each other at O.
OA = 3 cm and OD = 2 cm
As we know, diagonals of a parallelogram bisects each other.
Thus, AC = 2OA = 2× 3 = 6 cm
and BD = 2OD = 2× 2 = 4 cm
Hence, AC = 6 cm and BD = 4 cm.