According to the symmetric property (and common sense) line segmetn AB is congruet to line segment BA since they are the same segment, just with a different name
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Line BA
Yes, while naming a line segment, as long as the two points are on the line, it does not matter what order they are in or which points they are. well their not
we all know, a line segment is a portion of line with two fixed points A and B , but this segment has no specific direction i. e AB and BA are both line segments but if we give direction to this line segment suppose from A to B, then it becomes directed line segment, which is also called as vector AB having direction from A to B.so, a line segment with specific direction is called directed(having direction) line segment.
If these are vectors, then ba = - ab
AB and BA.