Find the perimeter of the rectangle if one of its sides is 26 cm and the other is 2 times smaller.

To solve this problem, remember that the perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, then P = 2 * (a + b), where a is the length, b is the width. Let’s calculate what is the second side of the rectangle.

26/2 = 13 centimeters.

Knowing that the sides are 26 centimeters and 13 centimeters long, we calculate the perimeter of the rectangle.

P = (26 + 13) * 2 = 39 * 2 = 78 centimeters.

Answer: 78 centimeters.