Number of sides Name
3 triangle or trigon
4 quadrilateral or tetragon
5 pentagon
6 hexagon
7 heptagon
8 octagon
9 enneagon
10 decagon
11 hendecagon
12 dodecagon
13
triskaidecagon or tridecagon
14
tetrakaidecagon or tetradecagon
15
pendedecagon
16
hexdecagon
17
heptdecagon
18
octdecagon
19
enneadecagon
20
icosagon
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