programming-examples/js/_Basic/Find the area of a triangle where lengths of the three of its sides are 5, 6, 7..js

var side1 = 5;   
var side2 = 6;   
var side3 = 7;   
var perimeter = (side1 + side2 + side3)/2;  
var area =  Math.sqrt(perimeter*((perimeter-side1)*(perimeter-side2)*(perimeter-side3)));  
console.log(area);