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.
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In plain geometry, if 2 lines never intersect, they are Parallel
One main characteristic of non-Euclidean geometry is hyperbolic geometry. The other is elliptic geometry. Non-Euclidean geometry is still closely related to Euclidean geometry.
molecular geometry is bent, electron geometry is tetrahedral
Molecular geometry will be bent, electron geometry will be trigonal planar
It has seesaw geometry.