class Circle(object):
    def _init_ (self, radius=3, color="blue"):
        self.radius=radius
        self.color=color
    
    def add_radius(self,r):
        self.radius =self.radius + r
        return (self.radius)

    def drawCircle(self):
        plt.gca().add_patch(plt.Circle(0,0), radius=self.radius, fc=self.color))
        plt.axis('scaled')
        plt.show()