The width of the rectangle is 18cm, which is 1/3 of its length. Find the perimeter of this rectangle.

It is known that the width of a rectangle is 18 centimeters, and these 18 centimeters are 1/3 of its length, which means that the length is three times its width. Find the perimeter of this rectangle.

The perimeter of a rectangle is equal to the sum of the lengths of all sides of the rectangle:

P = (a + b) * 2; P = a * 2 + b * 2; P = a + b + a + b.

Let’s write down the solution to the task by actions with explanations:

18 * 3 = 54 (cm) rectangle length;
(18 + 54) * 2 = 72 * 2 = 144 (cm) perimeter of the rectangle.
Answer: 144 centimeters perimeter of the rectangle.