A quadrilateral is a four-sided shape. The perimeter of a quadrilateral is the sum of all its sides. If the perimeter of a quadrilateral is 54 cm, and we know that all four sides are equal, we can divide 54 by 4 to find the length of each side.
54 cm / 4 = 13.5 cmTherefore, the length of each side of the quadrilateral is 13.5 cm.
It's important to note that this is only one possibility, since quadrilaterals can have different shapes and different side lengths.