If a square has a perimeter of 20 units, what is the length of one side?

To determine the length of one side of a square given its perimeter, it's essential to understand the relationship between the perimeter and the side length of a square. The formula for the perimeter ( P ) of a square is given by:

[ P = 4 \times \text{side length}

]

In this case, the perimeter is stated to be 20 units. To find the length of one side, you would rearrange the formula to solve for the side length:

[ \text{side length} = \frac{P}{4} ]

Substituting the given perimeter value into the equation results in:

[ \text{side length} = \frac{20}{4} = 5 \text{ units} ]

Thus, the length of one side of the square is indeed 5 units. This correctly reflects the mathematical principle that the total length around the square (the perimeter) is a result of adding together all four equal sides. Understanding this relationship confirms the solution without ambiguity.