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On paper = 2 dimensions Physical = 3 dimensions Examples: a square is 2 dimensions and a cube is 3 dimensions a circle is 2 dimensions and a ball is 3 dimensions
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.
2-D means 2 dimensions.
On a typical inch ruler the smallest lines are 1/16th dimensions. The next biggest are 1/8th", then 1/4", and finally 1/2".
It has 2 dimensions which are length and width