Just found this:
http://www.movable-type.co.uk/scripts/latlong-convert-coords.html

Number.prototype.toRad = function() {  // convert degrees to radians
  return this * Math.PI / 180;
};

Martin.


On 22 Sep, 00:49, Martin <[email protected]> wrote:
> From the documentation i'd say that 'number' simply means number as a
> primitive type not that number is an object defined by the API.
>
> So you want to add new methods to the javascript Number 
> class:http://www.google.co.uk/search?x=59&y=32&q=javascript+number+prototyp...
>
> Martin.
>
> On 21 Sep, 22:52, Jingyuan <[email protected]> wrote:
>
> > Hi,
>
> > In API v3, LatLng.lat() Returns the latitude in degrees, whose type is
> > 'number'
>
> > I want to make some extension like this:
> >     number.prototype.toRad = function { ... }
> > So that I can convert degree to rad directly by calling toRad()
> > method.
>
> > I wonder where is the 'number' defined in Maps API v3.
>
> > Thanks!
> > Jingyuan

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