A section; a category w/ similar material in it.
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They came from geometry. If you have a square whose sides are 1 unit long then its diagonal is sqrt(2) units long.
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.