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The first dimension is primary (length). The second dimension is secondary (width). The third dimmension is tertiary (height). Those are the 3 basic spatial dimensions. The fourth dimension is time. The fifth dimension is the rotation of primary. The sixth dimension is the rotation of secondary (and primary). The seventh dimension is the rotation of tertiary (secondary and primary). The eighth dimension is the pulse of time. The ninth dimension is the energy radiation of primary. The tenth dimension is the energy radiation of secondary. The eleventh dimension is the energy radiation of tertiary. In total there are 10 spatial dimensions and 1 time dimension, in other words, 11 spacetime 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.
Due to the fact that the Kilogram and the Meter measure two entirely different concepts, this question can not be answered. The meter measures a factor of only a single dimension, whereas the kilogram measures three (or probably more) dimensions. You can, for example, ask how many Kilograms are there in 300 cubic meters of x, due to the fact that cubic meters run in three dimensions.
the plane, or xy plane, has two dimensions space has 3 dimensions