
    Calculate the total perimeter distance of a delivery vehicle's circular service boundary from a distribution center, which defines the maximum coverage zone for route planning based on current conditions. The service boundary forms a perfect circle with radius r representing the maximum feasible delivery distance from the center.
    

    
def circle_circumference(r):
    """
    Calculate the total perimeter distance of a delivery vehicle's circular service boundary from a distribution center, which defines the maximum coverage zone for route planning based on current conditions. The service boundary forms a perfect circle with radius r representing the maximum feasible delivery distance from the center.
    

    """
def circle_circumference(r):
    """
    Calculate the total perimeter distance of a delivery vehicle's circular service boundary from a distribution center, which defines the maximum coverage zone for route planning based on current conditions. The service boundary forms a perfect circle with radius r representing the maximum feasible delivery distance from the center.
    

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