
    Design a function for the automated grading system that calculates the total surface area of a student's virtual cube model, given the length of one side in centimeters. The system will use this calculation to verify students' answers and provide immediate feedback on their understanding of 3D geometric concepts.
    

    
def surfacearea_cube(l):
    """
    Design a function for the automated grading system that calculates the total surface area of a student's virtual cube model, given the length of one side in centimeters. The system will use this calculation to verify students' answers and provide immediate feedback on their understanding of 3D geometric concepts.
    

    """
def surfacearea_cube(l):
    """
    Design a function for the automated grading system that calculates the total surface area of a student's virtual cube model, given the length of one side in centimeters. The system will use this calculation to verify students' answers and provide immediate feedback on their understanding of 3D geometric concepts.
    

    """
    surfacearea = 6 * l * l
    return surfacearea