The perimeter of the rectangle is 14 cm. The length of one of its sides is 4 cm.

The perimeter of the rectangle is 14 cm. The length of one of its sides is 4 cm. Find the length of the other side of the rectangle.

We denote by x the length of the unknown side of this rectangle.
According to the condition of the problem, the perimeter of this rectangle is 14 cm and the length of one of its sides is 4 cm, therefore, we can draw up the following equation:
2 * (x + 4) = 14.
We solve the resulting equation and find the unknown side of this rectangle:
2 * x + 2 * 4 = 14;
2 * x + 8 = 14;
2 * x = 14 – 8;
2 * x = 6;
x = 6/2;
x = 3.
Answer: The length of the other side of the rectangle is 3 cm.