In geometry, yes, those are different names of the same line segment.
No its not the same
Congruent line segment
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
They are not. A line segment is of finite length whereas a ray is infinitely long.
NO, but they can intercpet in a line which is not the same as a segment of course.
Yes. Because both "MN and "NM" are endpoints.
Collinear lines lie on the same straight line.
The two phrases are equivalent: collinear means in the same line [segment].
no they form a line segment
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
A line segment (sometimes just segment) is a pair of endpoints and all the points on a line between them.