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Line

In geometry a line:
 is straight (no curves),
 has no thickness, and
 extends in both directions without end (infinitely).

Line Segment
If it does have ends it would be called a " Line Segment".
Ray
If it has just one end it is called a "Ray"
Line, Plane and Solid
 A line is onedimensional
 A plane is two dimensional
 A solid is threedimensional




