The length of one side of the rectangle is 3.2 cm and the perimeter is 33.2 cm. Find the length of the second side of the rectangle.

From the condition it is known that the length of one side of the rectangle is 3.2 cm, and the perimeter is 33.2 cm. In order to find the length of the second side of the rectangle, we compose and solve a linear equation.

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

Now let’s remember and apply the formula for finding the perimeter of a rectangle:

P = 2 (a + b);

2 (x + 3.2) = 33.2;

x + 3.2 = 33.2: 2;

x + 3.2 = 16.6;

x = 16.6 – 3.2;

x = 13.4 cm length of the second side of the rectangle.

Answer: 13.4 cm length of the second side.