input: from typing import Tuple
  
  
  def calculate_rectangle_area(dimensions: Tuple[float, float]) -> float:
      """ Calculate the area of a rectangle given its length and width.
      >>> calculate_rectangle_area((4.0, 5.0))
      20.0
      >>> calculate_rectangle_area((0.0, 10.0))
      0.0
      """
      length, width = dimensions
      return length * width
output:     length, width = dimensions
      return length * width