//nodejs v4.2.6

'use strict';

class Point {
    constructor (x, y) {
        this.x = x;
        this.y = y;
    }

    length (point) {
        console.log(point);
        return Math.sqrt (Math.pow(this.x - point.x, 2) + Math.pow(this.y - point.y, 2));
    }
}

class Triangle {
    constructor (p1,p2,p3) {
        this.p1 = p1;
        this.p2 = p2;
        this.p3 = p3;
    }
    calcPerimeter () {
        let length1 = this.p1.length (this.p2);
        let length2 = this.p2.length (this.p2);
        let length3 = this.p1.length (this.p3);
        return length1 + length2 + length3;
    }
}

let p1 = new Point (1,1);
let p2 = new Point (2,2);
let p3 = new Point (3,3);
let triangle = new Triangle (p1,p2,p3);
console.log(triangle.calcPerimeter());