Great.
Can you please answer my questions now?
I did, but I'll expand on them for you.
How do you define "A"?
Blue line.
Do I have to be inside the capture perimeter of A to be on A?
Obviously not, please see the blue line.
Does A extend out some distance from the capture ring in your mind?
Please refer to the blue line.
Should I pace my steps from the capture ring (since I don't have a tape measure in the game as a selectable option) or should I just "wing it"?
Estimate it in regard to the blue line.
Would that mean I can't place any mines, for example, in any area that's NOT on a flag, like A?
No, please take a look at the blue line.
What about that space between A and B that's both "not on A" and also "not on B" or does this just apply to the flag nearest each uncap?
If you look in the image above, you'll see a blue line that gives you a good idea as to where the boundary is.
What's "near" mean? How near is near? Is there some "common sense" connotation for near that I don't know?
Near, meaning close, almost touching. Notice how the blue line above creates a small area from the uncap boundary and is inline with the red star.
What does "protection for me" mean? Is there some action I can take in the game that you wouldn't consider protection for me?
As long as you're not baiting, (which in most cases means idling at border with the intention of trying to get the enemy to shoot before you exit, when you clearly had time to leave safely), you have the freedom to move about your base, which includes waiting for vehicles and observing.