The perimeter of the parallelogram is 18.4 dm, one side is 3 dm, find the other side.

In order to find the length of the second side of the parallelogram, we will compose and solve the equation using the formula for finding the perimeter.

The condition states that the perimeter of the parallelogram is 18.4 in. It is also known that one side is equal to 3 dm.

Let’s introduce the variable x dm denoting with its help the length of the unknown side of the parallelogram.

Parallelogram perimeter:

P = 2 (a + b);

Let’s make the equation:

2 (3 + x) = 18.4;

3 + x = 18.4: 2;

3 + x = 9.2;

x = 9.2 – 3;

x = 6.2 dm length of the second side of the parallelogram.