code: def radius(self):
          '''
          Radius of the ellipse, Point class.
          '''
          try:
              return self._radius
          except AttributeError:
              pass
          self._radius = Point(1, 1, 0)
          return self._radiuf radius(self):
          '''
          Radius of the ellipse, Point class.
          '''
          try:
              return self._radius
          except AttributeError:
              pass
          self._radius = Point(1, 1, 0)
          return self._radius
docs: Radius of the ellipse, Point class.