正多邊形英文名

十五邊形=pentadecagon/quindecagon/pentakaidecagon
二十邊形=icosagon
三十六邊形=triacontahexagon
360邊形=trihectakaihexacontagon
60邊形=hexacontagon
90邊形=enneacontagon
40邊形=tetracontagon
180邊形=

2009-04-20 16:40:48 補充：
180邊形=hectakaioctacontagon


^ ^

2009-04-20 16:43:53 補充：
you can not find all but you can find the web sites of names of polygons in wiki ^\/^

In fact, you can find in http://www.geocities.com/quibowibbler/polygon.html
*\/*

十五邊形是''pentadecagon''或"quindecagon"或"pentakaidecagon"

二十邊形是 "icosagon"

2009-04-18 10:18:37 補充：
三十六邊形是"triacontakaihexagon''

60邊形是"hexacontagon"

90邊形是"enneacontagon"

40邊形是"tetracontagon"

You can check out the following website for all the answers:
http://en.wikipedia.org/wiki/Polygon