Answers

2015-01-09T17:41:24+08:00
3 triangle or trigon 4 rectangle or quadrilateral or tetragon 5 pentagon 6 hexagon 7 heptagon 8 octagon 9 nonagon or enneagon 10 decagon 11 hendecagon 12 dodecagon 13 triskaidecagon or tridecagon 14 tetrakaidecagon or tetradecagon 15 pendedecagon 16 hexakaidecagon or hexadecagon 17 heptdecagon 18 octdecagon 19 enneadecagon 20 icosagon
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