2D Shapes
No. of Sides  Name 
2  Digon 
3  Triangle (Trigon) 
4  Quadrilateral (Tetragon) 
5  Pentagon 
6  Hexagon 
7  Heptagon (Septagon) 
8  Octagon 
9  Nonagon (Enneagon) 
10  Decagon 
11  Hendecagon (Undercagon) 
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 
30  Triacontagon 
40  Tetracontagon 
50  Pentacontagon 
60  Hexacontagon 
70  Heptacontagon 
80  Octacontagon 
90  Enneacontagon 
100  Hectogon 
1000  Chiliagon 
10,000  Myriagon 
Using any of the following words you can work out the name of any sided shape with up to a ten thousand sides. For example: a kidney bean shaped pond, with shelfs around the sides that had 26 faces would be called an Irregular HexaIcosagon.
Remember: An irregular shape that does not have equal inside angles must be called an irregular, then the name of the shape.
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Edward Holmes, SMC @ CCMS, shapemakingclub@btconnect.com
