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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

14 tetradecagon

15 pentadecagon

16 hexadecagon

17 heptadecagon

18 octadecagon

19 enneadecagon

20 icosagon

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14y ago

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