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The most common sheet is 4' by 8' and they come in various thicknesses.
Generally drafting uses simple math, addition, subtraction, mulitplication, division, for calculating various dimensions. Math is also used for converting dimensions.
It is not possible to give an answer without any information as to what kinds of specimens the question is about.
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.