köken: Substantivized neuter adjective πεντάγωνος by ellipsis of the noun σχήμα (schíma, “shape”). Morphologically from πεντα- (“penta-”) + -γωνο (“-gon”).
köken: Etymology tree Latin quīnque Proto-Indo-European *h₂eng- Proto-Indo-European *h₂engulos Proto-Italic *angulos Latin angulus Latin quīnquangulus From quīnque (“five”) + angulus (“angled”).
köken: lầu (“building, high-rise”) + năm (“five”) + góc (“angle, corner”), calque of Chinese 五角樓 /五角楼 (Wǔjiǎolóu).
BulgarcaПентаго́н, петоъгълен, петоъгъ́лник
Slovakçapäťuholník
Slovencepeterokotnik
Letoncapiecstūris
Etimoloji
Borrowed from Late Latin pentagōnum, from Ancient Greek πεντάγωνον (pentágōnon, “pentagon”), neuter form of πεντάγωνος (pentágōnos, “five-angled”). Equivalent to penta- + -gono.