How many polygons can you do?

19 posts

» Quick access to the last post

zakaye
Joined: 5 Nov 2017
Posts: 47
Posted: 15 Dec 2018, 05:48 #
Posted: #
I can do:

Triangle - Cook Islands $2
Square - Malaya and British Borneo 1 cent
Hexagon - India 20 paise
Heptagon - United Kingdom 50 pence
Octagon - Iraq
Decagon - Hong Kong $5
Dodecagon - Fiji 3 pence/Australia 50 cents

Anyone got a pentagon, nonagon, hendecagon or higher?
Camerinvs
Joined: 19 May 2016
Posts: 6414
Posted: 15 Dec 2018, 06:04 #
Posted: #
Here's the hendecagon:



Most modern coins will have an uneven number of sides rather than even.
₱o$₮ag€ $₮am₱$ a₹€ mo₹€ £€₲i₮ima₮€ a$ a ƒo₹m oƒ ¢u₹₹€nc¥ ₮ha₦ ₮h€ €₦₮i₹€ "¢oi₦" ₱₹odu¢₮io₦ oƒ ₦au₹u o₹ ₦iu€. ••• £€$ ₮im฿₹€$-₱o$₮€ $o₦₮ ₱£u$ £é₲i₮im€$ €₦ ₮a₦t qu'o฿j€₮$ mo₦é₮ai₹€$ qu€ £a ₱₹odu¢₮io₦ €₦₮iè₹€ d€ «mo₦₦ai€$» d€ ₦au₹u ou d€ ₦iu€.
CassTaylor
Closed account
Posted: 15 Dec 2018, 06:23 #
Posted: #
Contributing a pentagon:


2014 Transnistria 5 Roubles
https://en.numista.com/catalogue/pieces64483.html

And I don't have this coin anymore because I shipped it off with my other modern coins to another Numista member earlier this week, but the modern 20 Korun coin from the Czech Republic is Tridecagonal (13-sided).
ZacUK Numista team
Joined: 3 Jan 2011
Posts: 16691
Posted: 15 Dec 2018, 07:52 #
Posted: #
I have the 22-sided ...

https://en.numista.com/catalogue/pieces1161.html

Have not yet got the 9-sided coin for my birthsign Pisces ...
https://en.numista.com/catalogue/pieces70714.html

I once got the 13-sided in a bulk lot but do not have pictures ...
https://en.numista.com/catalogue/pieces53900.html
Token collector [1600-1899] with some coins
CassTaylor
Closed account
Posted: 15 Dec 2018, 09:36 #
Posted: #
Quote: "ZacUK"​ I have the 22-sided ...
​
​https://en.numista.com/catalogue/pieces1161.html
I wasn't even aware that coin was 22-sided instead of round until just now!

Now that you mention it, in the 1880s there were also a bunch of multi-sided essai 10 centime coins, with 16 sides, 18 sides, and 24 sides.
ALLRED1950
Joined: 2 Jul 2012
Posts: 5049
Posted: 15 Dec 2018, 12:23 #
Posted: #
Here are afew of what I have on my desk
It is, what it is, or is it.
SpuDy Catalogue referee
Joined: 13 May 2017
Posts: 958
Posted: 15 Dec 2018, 17:15 #
Posted: #

4-sided
5-sided
6-sided
7-sided
8-sided
10-sided
11-sided
12-sided
13-sided
21-sided
22-sided
Frenchlover Catalogue referee
Joined: 16 Jul 2013
Posts: 13619
Posted: 15 Dec 2018, 21:15 #
Posted: #
9 Sided
Referee of south atlantic islands
Mr. Midnight Catalogue referee
Joined: 10 Mar 2017
Posts: 4329
Posted: 15 Dec 2018, 22:45 #
Posted: #
I have Egyptian octagon and hexagon from the Kingdom period, each one year only, 1933 and 1944 respectively.


here are different sizes of dodecagons from the UK and Nigeria



Canadian one cents were also dodecagons from 1982-1996, but i don't seem to have any at the moment.
Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac
zakaye
Joined: 5 Nov 2017
Posts: 47
Posted: 16 Dec 2018, 04:40 #
Posted: #
Quote: "Camerinvs"​Here's the hendecagon:
​
​
​
​Most modern coins will have an uneven number of sides rather than even.
​I can't believe I forgot about Loonies!
Frenchlover Catalogue referee
Joined: 16 Jul 2013
Posts: 13619
Posted: 17 Dec 2018, 00:46 #
Posted: #
14 sided - Australia

Referee of south atlantic islands
ngdawa
Joined: 18 Oct 2011
Posts: 6106
Posted: 17 Dec 2018, 15:07 #
Posted: #
Quote: "SpuDy"​
​4-sided
​5-sided
​6-sided
​7-sided
​8-sided
​10-sided
​11-sided
​12-sided
​13-sided
​21-sided
​22-sided
​but the french 25 centimes 1905 is round, isn't it?
Camerinvs
Joined: 19 May 2016
Posts: 6414
Posted: 17 Dec 2018, 16:56 #
Posted: #
Quote: "ngdawa"But the french 25 centimes 1905 is round, isn't it?
See ZacUK's link:
Quote: "ZacUK"​ I have the 22-sided ...
​
​https://en.numista.com/catalogue/pieces1161.html
​
₱o$₮ag€ $₮am₱$ a₹€ mo₹€ £€₲i₮ima₮€ a$ a ƒo₹m oƒ ¢u₹₹€nc¥ ₮ha₦ ₮h€ €₦₮i₹€ "¢oi₦" ₱₹odu¢₮io₦ oƒ ₦au₹u o₹ ₦iu€. ••• £€$ ₮im฿₹€$-₱o$₮€ $o₦₮ ₱£u$ £é₲i₮im€$ €₦ ₮a₦t qu'o฿j€₮$ mo₦é₮ai₹€$ qu€ £a ₱₹odu¢₮io₦ €₦₮iè₹€ d€ «mo₦₦ai€$» d€ ₦au₹u ou d€ ₦iu€.
Oklahoman Numista team
Joined: 20 Dec 2015
Posts: 3118
Posted: 20 Dec 2018, 00:53 #
Posted: #
Guadeloupe has 20 sided coins.
Library Media Specialist, columnist, collector, and gardener...
Frenchlover Catalogue referee
Joined: 16 Jul 2013
Posts: 13619
Posted: 20 Dec 2018, 01:04 #
Posted: #
Referee of south atlantic islands
Kazmooth58
Joined: 21 Mar 2024
Posts: 4
Posted: 14 Jun 2025, 15:42 #
Posted: #

I do have 3 sided - 15 sided, then 20 sided - 22 sided.

 

Mr. Midnight Catalogue referee
Joined: 10 Mar 2017
Posts: 4329
Posted: 14 Jun 2025, 19:34 #
Posted: #

Bravo! 

 

Welcome to Numista!

Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac
Kazmooth58
Joined: 21 Mar 2024
Posts: 4
Posted: 15 Jun 2025, 10:33 #
Posted: #

Thank you. 😀

Turi
Joined: 27 Nov 2018
Posts: 528
Posted: 16 Jun 2025, 03:50 #
Edited: 16 Jun 2025, 03:51
Posted: #
Edited:

I think we have here in Brazil an extreme exemple.

An icositetragonal (24-sided) coin. The 2000 reis of 1938:

N#9367

 

Turi
https://www.instagram.com/my_world_coins_collection
https://www.youtube.com/@passaportenumismatico
Reply
Forum »

» Forum policy

Used time zone is UTC+2:00.
Current time is 11:37.