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Two dimensional (2D) art could be a painting, or flat image. Three dimensional (3D) art could be a statue, or embossed (raised) image.
A 3-dimensional figure. It need not be solid since it could be a curve in 3-d space.A 3-dimensional figure. It need not be solid since it could be a curve in 3-d space.A 3-dimensional figure. It need not be solid since it could be a curve in 3-d space.A 3-dimensional figure. It need not be solid since it could be a curve in 3-d space.
It could be a pyramid.
A polygon is a 2-dimensional shape whereas a hexahedron is 3-dimensional. Therefore a polygon that is a hexahedron could by called a geometric impossibility.
There is no equivalence. A linear yard is a measure of length or distance in 1-dimensional space while a square metre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. In the case of the material being measured in linear yards, the width is a constant that is implicitly known to those using the measure. It could, for example, be the standard width of fabric, or rolls or paper.