The perimeter of the parallelogram = 126 cm.It is necessary to find the sides if one side is 3 cm larger than the other.

In order to find the sides of a parallelogram, we will recall the properties of the sides of a parallelogram and the formula for finding the perimeter of a parallelogram.

So, from the condition it is known that one of the sides of the parallelogram is 3 cm larger than the second, and its perimeter is 126 cm.

Opposite sides of a parallelogram are equal to each other.

We denote by x cm the length of one of the sides, then the length of the second side can be written as (x + 3) cm.

P = 2 (a + b);

2 (x + (x + 3)) = 126;

x + x + 3 = 126: 2;

2x + 3 = 63;

2x = 63 – 3;

2x = 60;

x = 60: 2;

x = 30 cm length of one side and 30 + 3 = 33 cm length of the second.