One side of the rectangle is twice as long as the other. The total length of these sides is 12 cm.

One side of the rectangle is twice as long as the other. The total length of these sides is 12 cm. Find the length of each side of this rectangle.

Let’s denote by x the smaller side of this rectangle.
According to the condition of the problem, one side of this rectangle is 2 times longer than the other, therefore, the length of the larger side of this rectangle is 2 * x.
It is also known that the total length of two sides of a given rectangle is 12 cm, therefore, we can draw up the following equation:
x + 2 * x = 12.
We solve the resulting equation:
3 * x = 12;
x = 12/3;
x = 4 cm.
Find the length of the longer side of this rectangle:
2 * x = 2 * 4 = 8 cm.
Answer: the sides of this rectangle are 4 cm and 8 cm.