
    Calculate the external surface area of a delivery truck's cylindrical fuel tank (excluding top and bottom faces) to determine the amount of protective coating needed during maintenance, where 'r' represents the tank's radius and 'h' represents its height. This calculation is essential for fleet maintenance scheduling and cost estimation across the delivery network.
    

    
def lateralsuface_cylinder(r, h):
    """
    Calculate the external surface area of a delivery truck's cylindrical fuel tank (excluding top and bottom faces) to determine the amount of protective coating needed during maintenance, where 'r' represents the tank's radius and 'h' represents its height. This calculation is essential for fleet maintenance scheduling and cost estimation across the delivery network.
    

    """
def lateralsuface_cylinder(r, h):
    """
    Calculate the external surface area of a delivery truck's cylindrical fuel tank (excluding top and bottom faces) to determine the amount of protective coating needed during maintenance, where 'r' represents the tank's radius and 'h' represents its height. This calculation is essential for fleet maintenance scheduling and cost estimation across the delivery network.
    

    """
    lateralsurface = 2 * 3.1415 * r * h
    return lateralsurface