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References to 'hexagon'
1. area of regular polygon by Wkbj79
2. Brianchon theorem by vmoraru
3. centered hexagonal number by PrimeFan
4. classification of Platonic solids by mps
5. diagonal by CWoo
6. example of a non-fully invariant subgroup by Algeboy
7. finite projective plane by Mathprof
8. Golab's theorem by Mathprof
9. hexagonal number by PrimeFan
10. Pascal's mystic hexagram by drini
11. polygon by Wkbj79
12. polygon by Mathprof
13. proof of Pappus's theorem by mathcam
14. regular polygon and circles by pahio
15. square root of 3 by PrimeFan
16. zonotope by mps