import math

class Point:

    def __init__(self, x, y):
        self.__x = float(x)
        self.__y = float(y)

    def getx(self):
        return self.__x

    def gety(self):
        return self.__y

    def distance_from_xy(self, x, y):
        return math.hypot(self.__x - x, self.__y - y)

    def distance_from_point(self, point):
        return self.distance_from_xy(point.getx(), point.gety())


class Triangle:

    def __init__(self, vertice1, vertice2, vertice3):
        self.__vertici = [vertice1, vertice2, vertice3]

    def perimeter(self):
        v = self.__vertici
        lato1 = v[0].distance_from_point(v[1])
        lato2 = v[1].distance_from_point(v[2])
        lato3 = v[2].distance_from_point(v[0])
        return lato1 + lato2 + lato3

triangle = Triangle(Point(0, 0), Point(1, 0), Point(0, 1))
print(triangle.perimeter())