Graham's Biggest Little Hexagon
The largest possible (not necessarily regular) Hexagon for which no two of the corners are more than unit distanceapart. In the above figure, the heavy lines are all of unit length. The Area of the hexagon is 
,where 
is the second-largest real Root of
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References
Conway, J. H. and Guy, R. K. ``Graham's Biggest Little Hexagon.'' In The Book of Numbers. New York: Springer-Verlag, pp. 206-207, 1996. Graham, R. L. ``The Largest Small Hexagon.'' J. Combin. Th. Ser. A 18, 165-170, 1975.
- Ford Circle
- Ford's Theorem
- Forest
- Fork
- Form
- Formal Logic
- Form (Geometric)
- Formosa Theorem
- Form (Polynomial)
- Formula
- Fortunate Prime
- Forward Difference
- Fountain
- Four Coins Problem
- Four-Color Theorem
- Fourier-Bessel Series
- Fourier-Bessel Transform
- Fourier Cosine Series
- Fourier Cosine Transform
- Fourier Integral
- Fourier Matrix
- Fourier-Mellin Integral
- Fourier Series
- Fourier Series--Power Series
- Fourier Series--Right Triangle