def get_field_tot_area(x):
    """ Total area of a plate field. """
    if len(x) == 6:
        width = 10
    else:
        width = x[7]
    plate_area = width * x[1]
    stiff_area = (x[2] * x[3] + x[4] * x[5]) * (width // x[0])
    return plate_area, stiff_area
