I did measure it on my own boat, but it is also from memory.
But you make a small mistake, you are supposed to add 800 mm to the diagonal distance from beam to hull end, see picture.
In your case it would be:
diagonal distance is: sqrt (2,35^2+1,1^2) =2,59m
Add 0,8m and the distance is 3,39m. I would say close.