Names of polygons with 21 sides to 60 sides?

You can either call them by n-gon for n sides (i.e. 21-gon) or combine a prefix and suffix (i.e. Icosikaihenagon).

No. of No. of

Sides Name Prefix Name Suffix Sides

20 Icosikai... ...henagon 1

30 Triacontakai... ...digon 2

40 Tetracontakai... ...trigon 3

50 Pentacontakai... ...tetragon 4

60 Hexacontakai... ...pentagon 5 70 Heptacontakai... ...hexagon 6

80 Octacontakai... ...heptagon 7

90 Enneacontakai... ...octagon 8

...enneagon 9

source: http://www.pubquizhelp.com/sci/polygon.html