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List of names of polygons by number of sides Print E-mail
(24 votes)
Created: Thursday, 13 September 2007

Number
of
sides

Polygon
Name

Internal
Angle

3 Triangle 60°
4 Square or Quadrilateral 90°
5 Pentagon 108°
6 Hexagon 120°
7 Heptagon 128.571°
8 Octagon 135°
9 Nonagon or Ennagon 140°
10 Decagon 144°
11 Hendecagon or Undecagon 147.273°
12 Dodecagon 150°
13 Triskaidecagon 152.308°
14 Tetrakaidecagon 154.286°
15 Pendedecagon 156°
16 Hexdecagon 157.5°
17 Heptdecagon 158.824°
18 Octdecagon 160°
19 Enneadecagon 161.053°
20 Icosagon 162°
30 Triacontagon 168°
40 Tetracontagon 171°
50 Pentacontagon 172.8°
60 Hexacontagon 174°
70 Heptacontagon 174.857°
80 Octacontagon 175.5°
90 Enneacontagon 176°
100 Hectagon 176.4°
1000 Chiliagon 179.640°
10000 Myriagon 179.964°
100000 Megagon 179.996°
10100 Googolgon ~180°

Number
of
Sides

Name
Prefix

 Note

Name
Suffix

Number
of
Sides

20 Icosikai...

Take the prefix
to the left and
add the suffix
to the right

 ... 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

Comments (1)add comment

bob said:

interesting
October 31, 2007

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busy
 
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