Perhaps what you are after is the fore triangle. The measurement from the top of your bridal to the hounds. Hounds to the turning block or the main beam. And the measurement from the mast base to the bridal. That is your triangle. It varies between different types of boat quite a lot.

The only thing that will be the same about f16 jibs of different boat or manufacturers is the area which is < 3.7 square meters.