The perimeter of the rectangle is 12.4 cm, one of its sides is 3.8 cm less from the other, find the area of the rectangle.

From the condition it is known that the perimeter of the rectangle is 12.4 cm, and we also know that one of its sides is 3.8 cm smaller than the other. In order to find the area of a rectangle on, you first need to find the lengths of the sides of the rectangle.

Let’s denote one of the sides by x, then the other side can be written as (x – 3.8).

Let’s remember the formula for finding the perimeter:

P = 2 (a + b);

2 (x + x – 3.8) = 12.4;

2x – 3.8 = 6.2;

2x = 6.2 + 3.8;

2x = 10;

x = 5 cm one side, 5 – 3.8 = 1.2 cm second side.

We are looking for an area using the formula:

S = a * b = 5 * 1.2 = 6 cm2