Given:
The given figure represents the original parallelogram and the reduction.
To find:
The length of side A in the new parallelogram.
Solution:
We know that the original figure is always similar to its reduction. So, both parallelograms are similar to each other.
The corresponding sides of similar figures are proportional.
Divide both sides by 45.
The length of side A in the new parallelogram is 2 cm. Therefore, the correct option is A.