Javascript Math Distance Calculation

// A normal distance calculation
function distance(x1,y1,x2,y2) {
     return Math.sqrt(Math.pow(y2-y1,2)+Math.pow(x2-x1,2));
}

// A somewhat simplified version using "with" to extend the scope
function distance2(x1,y1,x2,y2) {
    with (Math) {//from   ww  w. j  a v  a2s  . c o  m
        return sqrt(pow(y2-y1,2)+pow(x2-x1,2));
    }
}

console.log( distance(10,15,30,66) ); // 54.78138369920935
console.log( distance2(10,15,30,66) ); // 54.78138369920935