code: def area_of_a_triangle_in_cartesian_space( a, b, c ):
      
      return 0.5 * np.linalg.norm( np.cross( b-a, c-a ) )
docs: Returns the area of a triangle defined by three points in Cartesian space.
  
      Args:
          a (np.array): Cartesian coordinates of point A.
          b (np.array): Cartesian coordinates of point B.
          c (np.array): Cartesian coordinates of point C.
  
      Returns:
          (float): the area of the triangle.