
    Design a function to calculate the total external surface area of a wearable vital signs monitoring device with a cubic housing, where the length of each side is known. The surface area calculation is essential for determining the device's skin contact area and heat dissipation capacity, which directly affects patient comfort and sensor accuracy.
    

    
def surfacearea_cube(l):
    """
    Design a function to calculate the total external surface area of a wearable vital signs monitoring device with a cubic housing, where the length of each side is known. The surface area calculation is essential for determining the device's skin contact area and heat dissipation capacity, which directly affects patient comfort and sensor accuracy.
    

    """
def surfacearea_cube(l):
    """
    Design a function to calculate the total external surface area of a wearable vital signs monitoring device with a cubic housing, where the length of each side is known. The surface area calculation is essential for determining the device's skin contact area and heat dissipation capacity, which directly affects patient comfort and sensor accuracy.
    

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