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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
Paper comes in a variety of different sizes including 4A0, 2A0, A0 and A1 through A10. The dimensions of A2 paper are 594 by 420 mm or 23.4 by 16.5 inches.
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.
No
the plane, or xy plane, has two dimensions space has 3 dimensions