Find the perimeter of the rectangle if its area is 18 cm2 and the length of one side is 3 cm.

The area of a rectangle is calculated as the product of length and width. S = a * b
We know the area of the rectangle and the length of one side, calculate the length of the other side:
1) 18cm2: 3cm = 6cm length of the other side.
Knowing the length and width, we calculate the perimeter of the rectangle. The perimeter is calculated as the sum of the length and width times two.
P = 2 * (a + b)
2) 2 * (3cm + 6cm) = 2 * 9cm = 18cm perimeter of the rectangle
Answer: The perimeter of the rectangle is 18 centimeters.