b'\n_START_ARTICLE_\nDevetkotnik\n_START_PARAGRAPH_\nDev\xc3\xa9tkotnik ali s tujko n\xc3\xb3nagon ali eneagon (starogr\xc5\xa1ko enneag\xc5\x8dnos < \xce\xb5\xce\xbd\xce\xbd\xce\xb5\xce\xb1: ennea - devet + \xce\xb3\xcf\x89\xce\xbd\xce\xbf\xce\xbd: g\xc5\x8dnos - ki ima kote < \xce\xb3\xcf\x89\xce\xbd\xce\xaf\xce\xb1: gonia - kot) je v ravninski geometriji mnogokotnik z devetimi stranicami, devetimi ogli\xc5\xa1\xc4\x8di in devetimi notranjimi koti.\n_START_SECTION_\nKonstrukcija\n_START_PARAGRAPH_\nPravilnega devetkotnika ne moremo skonstruirati z ravnilom in \xc5\xa1estilom.'