I can only answer the first ones and I believe these are correct
The length of AI is 3.25 in
As we can see CD is 1.3 in and on GH is it 1.2 so we add that which gives us 2.5. But there is some space left in the middle. Looking at the right side there is the measurement of the space that is left which is 0.75. Which gives me 3.25 in
The length of IH is 4.5. I believe it is 4.5 in because IF is 9 in in total, but IH is only halfway, so 9 divided by 2 equals 4.5.
I hope this helps and that this is correct. My apologies for not being able to answer the last question and if there are wrong but I believe they are correct.