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@danyboii
Count the sides.
3 triangle, trigon 4 quadrilateral, tetragon 5 pentagon 6 hexagon 7 heptagon 8 octagon 9 nonagon, enneagon 10 decagon 11 hendecagon 12 dodecagon, duodecagon 13 triskaidecagon, tridecagon 14 tetrakaidecagon, tetradecagon 15 pentadecagon 16 hexadecagon 17 heptadecagon 18 octadecagon 19 enneadecagon 20 icosagon
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