Is there a method or script to obtain the area of a polygon? A star shape for example?

Try _cVolume by Max Smirnov! ;)

http://moi.maxsm.net/media/files/

Of course you must have a surface and not only the edges curve!
So select the surface then launch the script!

That's a very useful script Pilou, thank you for bringing it to attention!

Thanks Pilou. I had this script already, but the name "Volume" misled me. I should have known Max would not forget to include "Area" :)