Retrieves a tuple with the x,y coordinates of the lower right point of the ellipse. 
        Requires the radius and the coordinates to be numbers

def getBottomRight(self):
        """
        Retrieves a tuple with the x,y coordinates of the lower right point of the ellipse. 
        Requires the radius and the coordinates to be numbers
        """
        return (float(self.get_cx()) + float(self.get_rx()), float(self.get_cy()) - float(self.get_ry()))