Space is a boundless, three dimensional set of all points. Collinear is a set of points that are all on the same line and is 3 or more points.
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Space
circle
The surface of a sphere is defined in that manner.
Well, darling, all one-dimensional and two-dimensional objects lie in a plane. It's like their little playground where they can stretch out and show off their shapes. So next time you see a line or a square strutting its stuff, just remember they're lounging in the fabulous world of a plane.
This is the definition of a line segment. They are used in constructing two-dimensional polygons.