
    Design a function that calculates the boundary length of a content moderation zone, where AI algorithms analyze posts for inappropriate content in a circular area. The moderation zone's influence extends radially from a flagged post, and determining its perimeter is crucial for optimizing the scanning area of content filtering algorithms.
    

    
def circle_circumference(r):
    """
    Design a function that calculates the boundary length of a content moderation zone, where AI algorithms analyze posts for inappropriate content in a circular area. The moderation zone's influence extends radially from a flagged post, and determining its perimeter is crucial for optimizing the scanning area of content filtering algorithms.
    

    """
def circle_circumference(r):
    """
    Design a function that calculates the boundary length of a content moderation zone, where AI algorithms analyze posts for inappropriate content in a circular area. The moderation zone's influence extends radially from a flagged post, and determining its perimeter is crucial for optimizing the scanning area of content filtering algorithms.
    

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