the plane, or xy plane, has two dimensions space has 3 dimensions
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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
There are infinitely many: 1*22, 5*4.4, 4*5.5 are three examples.
yes
I believe you want to know what "4-DIMENSIONAL" is. Dimension, dimensional (adjective). It means something with 4 dimensions.
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.