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A standard CD:- 15mm Internal diameter, 120mm external diameter, 1.1 mm thick A mini CD:- 15mm Internal diameter, 80mm external diameter, 1.1 mm thick
The drum should measure 23 inches diameter 36 inches height These are all external measurements.
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
The main sources of external data are the Internet; the government; trade, business, and professional associations; the media; trade journals; universities and foundations; corporate annual reports
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.