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Two-dimensional shapes are the ones we are most familiar with: squares, circles, triangles, etc. "Two dimensional" means that they have only length and breadth and no depth, which means they can only exist on surfaces.
It is a generalization of the notion of a sequence used to define the notion of convergence in general topolopgy.
I define an variable by saying x- an value
Define these Levels of Measurement.NominalOrdinalInterval/Ratio
4 points define a plane.