The reason why a stretched string is not a line because it's consists of two finite points. Point "A" and Point "B'. While having two points defines a line, a string is only as finite as it's length. A true line is infinite.
If your hand holds a string and stretches it, you've actually made a line segment because it has two end points and does not extend infinitely in either direction (it ends at your fingers or points).
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do it yourself, think !
explain the differences between a point and a line and a plant
Points that are collinear will be located on the same line. A line is a subset of a plane. Therefore, Yes, points that are collinear will be located on the same plane.
it's a loop
No, it can only have one midpoint, because if it had two midpoints, then there would be two line segments! Also, if you add two midpoints, then thus creating another segment.