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List of names of polygons by number of sides

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(167 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 (11) add comment

bob said:

interesting

October 31, 2007

doodly doo said:

this list totally helped me! :D

April 14, 2009

Gingy said:

CAN I ASK WHY PEOPLE WASTE THERE TIME DOING THIS, BUT IT WAS HELPFUL

June 02, 2009

hey said:

ok this was rather helpful for my h/w!!! :D but wouldnt do it in my spare time!!!

June 29, 2009

This list got me an A on my Math homework thanks a lot
people waste their time to help others which should really be appreciated so I give this page an A ,5 stars, a perfect score and a BIG THANKS! :)

November 11, 2009

Teh Dude said:

Ty, helped with H/W a lot. :D Good list. :P

November 11, 2009

john said:

thank you for helping me do the homework :) ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D

February 17, 2010

tella said:

V.G! my h/w is all right! :) :) :)

March 14, 2010

Cool Math Dude said:

Awesome! Now this is something I'd do in my spare time! Thanks, your site was great! Now for a little advertising, To see this list w pictures, go to www.planefigures_Math Dude.com ( Site is currently not ready. Check on 52510.
It will be ready by then.

May 05, 2010