input: from typing import Tuple
  
  def calculate_rectangle_area(length: float, width: float) -> float:
      """
      Calculate the area of a rectangle given its length and width.
  
      >>> calculate_rectangle_area(5.0, 3.0)
      15.0
      >>> calculate_rectangle_area(10.0, 2.0)
      20.0
      """
  
output:     return length * width