
    Calculate the total perimeter distance of a delivery zone boundary from a central distribution hub to help optimize fleet distribution and route planning. The delivery zone is perfectly circular, with the distribution center at its center point, and drivers need to know the maximum possible distance they might need to travel along the zone's edge when serving customers in different areas.
    

    
def circle_circumference(r):
    """
    Calculate the total perimeter distance of a delivery zone boundary from a central distribution hub to help optimize fleet distribution and route planning. The delivery zone is perfectly circular, with the distribution center at its center point, and drivers need to know the maximum possible distance they might need to travel along the zone's edge when serving customers in different areas.
    

    """
def circle_circumference(r):
    """
    Calculate the total perimeter distance of a delivery zone boundary from a central distribution hub to help optimize fleet distribution and route planning. The delivery zone is perfectly circular, with the distribution center at its center point, and drivers need to know the maximum possible distance they might need to travel along the zone's edge when serving customers in different areas.
    

    """
    perimeter = 2 * 3.1415 * r
    return perimeter