# Answer to Question #19910 in Abstract Algebra for lelsie

Question #19910

number of sides of polygons

Expert's answer

A geometrical figure with three or more sides is called a polygon or a polyhedron. Here are the names for some polygons.

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

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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