Final answer:
The formula for the perimeter (P) of a square is P = 4s, where s is the length of a side.
Step-by-step explanation:
The formula for the perimeter (P) of a square with side length (s) is:
P = 4s
Each side of a square has the same length, so by multiplying the length of one side by 4, we get the total perimeter of the square.