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QED, Fermat's Last Theorem.
A full rotation of a circle is equal to 360 degrees. Area of a circle is: pi times radius squared.
It is an angle that has a turn of less than 360 degrees which is a full turn.
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