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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.
This question cannot be answered sensibly. A litre is a measure of volume, with dimensions [L3]. A metre is a measure of distance, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information. The question is like asking how many cups of water is my walk to school?
the plane, or xy plane, has two dimensions space has 3 dimensions
The dimensions of a plane are length and width.