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2-D means 2 dimensions.
the most typical dimensions would be 2cm x 3cm X 3cm
it mean the average
89*2.54cm= D of Table
In 2 dimensions, that would be a circle. In 3 dimensions, that would be a sphere. * * * * * or, in 2 d, an ellipse or a smooth meandering curve. in 3 d, an ellipsoid, a toroid, a smooth blob. and many more.