It is possible to draw a unique parallelogram with side lengths 4 cm and 9 cm.
We can draw a parallelogram with side length 4 cm and 9 cm for e.g.
Step 1: Draw AB = 4 cm.
Step 2: Draw angle 60∘ at B and mark a point C along the same angle at 9 cm.
Step 3: Draw a line parallel to AB passing through C measure 4 cm and mark D on it.
Step 4: Join A, B, C& D to get the parallelogram ABCD.
Now, in step 2, we can change the angle and we can get different parallelograms. So, there are infinite parallelograms possible with adjacent sides as 4 cm and 9 cm.