Measuring angle between two points

Simple example of measuring angle between two points. 
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>

var angle_degrees;

var p1 = Object();
    p1.x = 30;
    p1.y = 14;

var p2 = Object();
    p2.x = 42;
    p2.y = 25;

angle_degrees = Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180 / Math.PI;
    
console.log("The angle between two points is " + angle_degrees);

</script>
</body>
</html>
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