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Plane. A point has no dimension, a line has one dimension, and a plane has two dimensions.
Yes, one dimension associated with a measure of length.
Yes. A line segment has one dimension.
There are lots of one-dimension shapes.
like a ray, line segment and line.
oneA line segment has one dimension - length, from one end of the line to another. The line is not considered to have any width or thickness.
A Line