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I have asked them about this several times, and apparently it's not very straightforward for them to implement in fusion. I don't know why, since in autocad you can do arc lengths in about ten different ways. You can get around this by making a custom parameter. Search the autodesk forums and you will find a few posts where it is explained.

Yes, you just have to use the Educational Version. And you can only have 10 editable/active projects. If you want more than 10 projects, you have to make your editable project as Read Only until you want to alter them again.