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Measuring dimensions of small things.
Generally drafting uses simple math, addition, subtraction, mulitplication, division, for calculating various dimensions. Math is also used for converting dimensions.
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.
the plane, or xy plane, has two dimensions space has 3 dimensions