Mai girma dabam-dabam shi ne polygon da ke saman fili, wanda aka siffanta shi da jerin baka na manyan da'irar da ke haɗe da samansa. A takaice dai, siffa ce da aka rufe a saman wani yanki, wanda aka kafa ta hanyar haɗa jerin maki tare da arcs na manyan da'ira. An auna kusurwoyi da ɓangarorin polygon mai ɗaiɗai a cikin radians, kuma sun sha bamban da na polygon mai tsari saboda lanƙwan sashe. Siffar polygons suna da mahimman aikace-aikace a cikin geodesy, kewayawa, da astronomy, a tsakanin sauran fannoni.