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The actual dimensions of a modern 2x4 is 1.75 by 3.5 inches.
A 2X6 is 5 1/2 inches wide. Incidentally it's 1 1/2 inches thick. Pre-WWII lumber was cut at stated dimensions, a 2x4 was actually 2 inches by 4 inches.
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.