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Three-Dimensional

The Basics of 3-Dimensional Shapes

The shapes that we deal with in plane geometry (geometry contained within a plane) is 2-dimensional.  Shapes have length (y-axis) and width (x-axis).

But, of course, there is a whole world of 3-dimensional figures out there as well. Three dimensional shapes have one more dimension than 2-dimensional shapes: height (typically graphed on the z-axis, but that's beyond the scope of this lesson).