They're not. A line segment is just two points connected. A line however, goes on forever in both directions. And then there's a ray that goes on forever in just one direction.
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They are not. A line segment is of finite length whereas a ray is infinitely long.
Collinear lines lie on the same straight line.
Yes. Because both "MN and "NM" are endpoints.
no they form a line segment
Any straight line from the centre to the circumference is a radius and all are the same length.