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
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Cardboard comes in different weights, depending on thickness, whether it is corrogated (i.e. with spaces), pressed, etc. So, the answer would depend first on the type and weight of the cardboard. Regardless of type of cardboard or the weight of the type, I would guess it would weigh far less than the CD and CD case together. I would further guess it would weigh about or less than the plastic CD case without the CD, with both CD and and extra cardboard piece being the same dimensions (height+width) and if the cardboard was thin. Lifes
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
The dimensions of a plane are length and width.