
    Design a function for an automated geometry assessment system that calculates the perimeter of a student's circular writing area on a digital canvas, where students practice their mathematical explanations. The system must use the student-provided radius measurement to determine the total boundary length of their writing space, enabling instant feedback on their spatial awareness and calculation accuracy.
    

    
def circle_circumference(r):
    """
    Design a function for an automated geometry assessment system that calculates the perimeter of a student's circular writing area on a digital canvas, where students practice their mathematical explanations. The system must use the student-provided radius measurement to determine the total boundary length of their writing space, enabling instant feedback on their spatial awareness and calculation accuracy.
    

    """
def circle_circumference(r):
    """
    Design a function for an automated geometry assessment system that calculates the perimeter of a student's circular writing area on a digital canvas, where students practice their mathematical explanations. The system must use the student-provided radius measurement to determine the total boundary length of their writing space, enabling instant feedback on their spatial awareness and calculation accuracy.
    

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