Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    if (typeof Number.prototype.toRad === 'undefined') {
        Number.prototype.toRad = function() {
            return this * Math.PI / 180;
        };
    }
    
    function lawofcosines1(lat1, lon1, lat2, lon2) {
        var R = 6371000,
            a = Math.sin(lat1.toRad()) * Math.sin(lat2.toRad()),
            b = Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) * Math.cos((lon2 - lon1).toRad()),
            c = Math.acos(a + b),
            d = R * c;
    
        return d.toFixed(2);
    }
    
    function lawofcosines2(lat1, lon1, lat2, lon2) {
        var lat1 = lat1.toRad(),
            lat2 = lat2.toRad(),
            a = Math.sin(lat1) * Math.sin(lat2),
            b = Math.cos(lat1) * Math.cos(lat2) * Math.cos((lon2 - lon1).toRad()),
            c = Math.acos(a + b);
    
        return (6371000 * c).toFixed(2);
    }
    
    function lawofcosines3(lat1, lon1, lat2, lon2) {
        var lat1 = lat1.toRad(),
            lat2 = lat2.toRad(),
            a = Math.sin(lat1) * Math.sin(lat2),
            b = Math.cos(lat1) * Math.cos(lat2) * Math.cos((lon2 - lon1).toRad()),
            c = Math.acos(a + b),
            d = 6371000 * c;
    
        return d.toFixed(2);
    }
    
    function lawofcosines4(lat1, lon1, lat2, lon2) {
        var lat1 = lat1.toRad(),
            lat2 = lat2.toRad(),
            a = Math.sin(lat1) * Math.sin(lat2),
            b = Math.cos(lat1) * Math.cos(lat2) * Math.cos((lon2 - lon1).toRad()),
            c = Math.acos(a + b),
            d = (6371000 * c).toFixed(2);
    
        return d;
    }
  };
</script>

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lawofcosines1(-31.965379, 115.822077, -33.85789, 151.214806);

lawofcosines2(-31.965379, 115.822077, -33.85789, 151.214806);

lawofcosines3(-31.965379, 115.822077, -33.85789, 151.214806);

lawofcosines4(-31.965379, 115.822077, -33.85789, 151.214806);

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