Calc distance between 2d points and poly area

area.js

class Polygon {
    static calcArea (...points) {

        var area = 0;
        var X = points.map((v) => { return v[0] });
        var Y = points.map((v) => { return v[1] });

        var numPoints = points.length;
        var j = numPoints - 1; 
        var i = 0;
        for (i; i<numPoints; i++)
        { area +=  (X[j]+X[i]) * (Y[j]-Y[i]); 
            j = i; 
        }
        return Math.abs(area/2);
    }
}

class Distance {

    calcDistance (point1, point2) {
        //return Math.sqrt( Math.pow((point2[0]-point1[0]), 2) + Math.pow((point2[1]-point1[1]), 2) );
        return Math.hypot(point2[0]-point1[0], point2[1]-point1[1]);

    }

    constructor(point1, point2) {
        this.X1 = point1[0];
        this.Y1 = point1[1];
        this.X2 = point2[0];
        this.Y2 = point2[1];
        this.distance = this.calcDistance(point1, point2);
    }
}


/**
 * Usage
 */
var tA = [560435, 163627];
var tB = [560480, 163657];
var tC = [560447, 163734];
var tD = [560429, 163740];
var tE = [560406, 163794];
var tF = [560387, 163783];

var allPoints = {
    "AB" : new Distance(tA, tB),
    "BC" : new Distance(tB, tC),
    "CD" : new Distance(tC, tD),
    "DE" : new Distance(tD, tE),
    "EF" : new Distance(tE, tF),
    "FA" : new Distance(tF, tA),
}


console.table(allPoints);
var areaBig = Polygon.calcArea(tA, tB, tC, tD, tE, tF);
var areaSmall = Polygon.calcArea([0,0], [1,0], [1,-1], [0, -1]);
console.log(areaBig);
console.log(areaSmall);