There is no particular arrangement.
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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.
we made a arrangement to go to the beach on Saturday
the plane, or xy plane, has two dimensions space has 3 dimensions
Electrons are arranged in shells around the atom.