toRad() Javascript function throwing error

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You are missing a function declaration.

In this case toRad() must be defined first as:

/** Converts numeric degrees to radians */
if (typeof(Number.prototype.toRad) === "undefined") {
  Number.prototype.toRad = function() {
    return this * Math.PI / 180;
  }
}

according to the code segment all at the bottom of the page

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