Almost everything is different!
A polygon is a closed shape in 2 dimensional space, bounded by straight lines. Three dimension is a description of normal space.
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A plane is found in two dimensions; a surface is part of a three-dimension object, including possibly a set of planes, such as a cube or a pyramid.
A regular polygon with three sides - is an equilateral triangle.
A polygon with three sides is a triangle, the prefix tri- meaning three.
it can be three dimensional. a polygon is three sided or more like a triangle. so to answer your question, yes.
The difference is 7/24 .