code: def areas(self):
          
  
          return _stripack.triareas(self.x, self.y, self.z, self.simplices.T+1)
docs: Compute the area each triangle within the triangulation of points
          on the unit sphere.
  
          Returns
          -------
           area : array of floats, shape (nt,)
              area of each triangle in self.simplices where nt
              is the number of triangles.
  
          Notes
          -----
           This uses a Fortran 90 subroutine that wraps the AREA function
           to iterate over many points.