A shape
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A plane is a flat surface with no thickness. Our world has three dimensions, but there are only two dimensions on a plane.
Flat shapes such as polygons are two-dimensional.
Presumably it is simply geometry. However, plane geometry is geometry which is limited to objects with up to two dimensions, that is, objects that lie in a plane - or on a flat surface.
It is a surface with zero curvature. It is 2-dimensional and in those two dimensions it extends infinitely far.It is a surface with zero curvature. It is 2-dimensional and in those two dimensions it extends infinitely far.It is a surface with zero curvature. It is 2-dimensional and in those two dimensions it extends infinitely far.It is a surface with zero curvature. It is 2-dimensional and in those two dimensions it extends infinitely far.
Two - of length.