I think its BA.
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Just label it with a symbol of your choice and that is its name! Some people prefer a lower case letter but that is not a necessity.
827/1000 is another way of writing it
It's not clear from the question whether 'P' is the center of the circle, or maybe the circumference.The distance from the center to the midpoint of AB is 8 mm.The distance from the midpoint of AB the rest of the way to the circumferenceof the circle is 2 mm.
In a triangle ABC, they are AB, BC and CA.
Cylinder