
    Calculate the total distance delivery vehicles must travel to patrol the complete boundary of a square delivery zone, given the zone's side length in kilometers. This perimeter calculation is essential for route planning and fuel consumption estimates when vehicles need to monitor or service the entire border of their assigned delivery territory.
    

    
def square_perimeter(a):
    """
    Calculate the total distance delivery vehicles must travel to patrol the complete boundary of a square delivery zone, given the zone's side length in kilometers. This perimeter calculation is essential for route planning and fuel consumption estimates when vehicles need to monitor or service the entire border of their assigned delivery territory.
    

    """
def square_perimeter(a):
    """
    Calculate the total distance delivery vehicles must travel to patrol the complete boundary of a square delivery zone, given the zone's side length in kilometers. This perimeter calculation is essential for route planning and fuel consumption estimates when vehicles need to monitor or service the entire border of their assigned delivery territory.
    

    """
    perimeter = 4 * a
    return perimeter