Yeah, why the suspense?
I have one of those angle combination square doohickies from harbor freight. It has a 16" rule. If I wear glasses I can get pretty close to a 1/2 degree. That’s assuming this thing is accurate enough to matter. I cut pieces for a pyramid this past weekend and they came out pretty close. I was surprised, actually,
Another way I’ve done is to use a 12" speed square and mark the angle I want from the pivot point. That can work very well.
Then again you may have very accurately marked your angles and it doesn’t mean a hill of beans when it comes time to cut. LOL
Losing fingers since 1969