a line can be indefinitely extended but a line segment is a part. a line segment cannot be extended:)
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A line is continuous with no ending whereas a line segment is defined as having end points.
No. There is exactly one line (and therefore line segment) through any two points.
line segment
A line segment is a line between two points, while rays only has one end point and goes infinitely from that point in a direction.
Mostly because, assuming it just one segment, a midpoint by definition (mid- means middle) is the point at the exact middle of a line segment; whereas the length of the segment is the entire length of the segment. Pretty much, a midpoint is a point in the middle of the line, the length is the measurement of the same line.