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### Polygon names

The polygon is a closed plane figure composed by a non specified number of straight line segments that join in pairs at their endpoints. A polygon is regular, when all the sides and internal angles are equal. On the contrary it is irregular.
The polygons are known by the number of sides. A polygon may also be named as n-gon. Example:
1) 4-gon is a polygon with 4 sides;
2) 6-gon is a polygon with 6 sides.
3) 20-gon is a polygon with 20 sides.
How to calculate the elements of Regular polygon.

 Polygon names Sides Names 3 triangle 4 quadrilateral 5 pentagon 6 hexagon 7 heptagon 8 Octagon 9 nonagon, enneagon 10 decagon 11 undecagon, hendecagon 12 dodecagon 13 tridecagon, triskaidecagon 14 tetradecagon, tetrakaidecagon 15 pentadecagon, pentakaidecagon 16 hexadecagon, hexakaidecagon 17 heptadecagon, heptakaidecagon 18 octadecagon, octakaidecagon 19 enneadecagon, enneakaidecagon 20 Icosagon 21 icosikaihenagon, icosihenagon 22 icosikaidigon 23 icosikaitrigon 24 icosikaitetragon 25 icosikaipentagon 26 icosikaihexagon 27 icosikaiheptagon 28 icosikaioctagon 29 icosikaienneagon 30 triacontagon 31 triacontakaihenagon 32 triacontakaidigon 33 triacontakaitrigon 34 triacontakaitetragon 35 triacontakaipentagon 36 triacontakaihexagon 37 triacontakaiheptagon 38 triacontakaioctagon 39 triacontakaienneagon 40 tetracontagon 50 pentacontagon 60 hexacontagon 70 heptacontagon 80 octocontagon 90 eneacontagon 100 hectogon, hecatontagon 1000 chiliagon 10.000 miriagon 100.000 decemiriagon