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// Converts from degrees to radians.
Math.radians = function(degrees) {
  return degrees * Math.PI / 180;
};
 
// Converts from radians to degrees.
Math.degrees = function(radians) {
  return radians * 180 / Math.PI;
};

// http://cwestblog.com/2012/11/12/javascript-degree-and-radian-conversion/