The perimeter of the rectangle is 66 in. The length of one side is 3.11. Find the area of a rectangle.

It is known from the condition that the perimeter of the rectangle is 66 dm. It is also known that the length of its one side is 3.11 dm. In order to find the area of the rectangle, we calculate the length of the second side.

Let’s remember and apply the formula to find the perimeter of a rectangle.

P = 2 (a + b), where a and b are the length and width of the rectangle.

Let us denote by the variable x dm the length of the second side. Substitute and calculate:

2 (3.11 + x) = 66;

3.11 + x = 66: 2;

3.11 + x = 33;

x = 33 – 3.11;

x = 29.89 in. length of the second side of the rectangle.

We are looking for an area using the formula:

S = a * b = 3.11 * 29.89 = 92.9579 dm2.