input: from typing import List
  
  
  def find_rectangle_areas(rectangles: List[Rectangle]) -> List[float]:
      """ Given a list of Rectangle objects, return a list of their areas.
      >>> rect1 = Rectangle(4, 5)
      >>> rect2 = Rectangle(3, 3)
      >>> find_rectangle_areas([rect1, rect2])
      [20.0, 9.0]
      """
output:     return [rect.width * rect.height for rect in rectangles]