The perimeter of the parallelogram is 18.4 dm. One side is 7 dm. Find the other side

To find the second side of a parallelogram, we will compose and solve a linear equation using the formula for finding the perimeter of a parallelogram.

Let’s see what is given to us.

The known perimeter of the parallelogram is 18.4 dm. It is also known that one side is equal to 7 dm.

Let’s use the variable x dm to denote the length of the second side.

P = 2 (a + b);

Let’s make the equation:

2 (7 + x) = 18.4;

7 + x = 18.4: 2;

7 + x = 9.2;

x = 9.2 – 7;

x = 2.2 cm is the length of the second side of the parallelogram.

Answer: 2.2 cm.