Those numbers will have little bearing on the actual dimensions of your boat. They are the generally assumed measurement for your boat for the purpose of generating racing rating. In reality there are pretty big variations from one individual boat of a given model and another.
If you are planning to have new sails made, you should really have the sailmaker measure your particular boat.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay