Answer:
48 meters.
Explanation:
The perimeter of a parallelogram is given by the formula:

Where a is the measure of the length (top), and b is the measure of the slant height (side).
We know that the perimeter is 102.
We also know that the top is 3.
So, let’s substitute 102 for P and 3 for a and solve for b, the side. So:

Divide both sides by 2:

Subtract 3 from both sides:

Therefore, the side measures 48 meters.