Math help!

Hi friends!!
I’m doing a brochure for my class but I need some math help.

I’m trying to do a gate fold… and it would be easy to just fold and take measurements… but it has to be perfect… so i have to take into consideration what the dimensions would be when I folded it… so there is no big bulge when you look at it from the side.

SO… if you look at that it shows you how to do the folding… i need someone to tell me what the dimensions and where the folds would be for my paper… which is 11x17

any help anyone can give would be fantastic!!!
thank you very much