List of polygons geometry , a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain . These segments are called its edges or sides , and the points where two edges meet are the polygon's vertices or corners .polygon comes from Late Latin polygōnum , from Greek πολύγωνον, noun use of neuter of πολύγωνος, meaning "many-angled". Individual polygons are named according to the number of sides, combining a Greek-derived numerical prefix with the suffix -gon , e.g. pentagon , dodecagon . The triangle , quadrilateral and nonagon are exceptions, although the regular forms trigon , tetragon , and enneagon are sometimes encountered as well.Polygons are primarily named by prefixes from Ancient Greek numbers.English cardinal number English ordinal number Greek cardinal number Greek ordinal number one first heis protos two second duo deuteros three third treis tritos four fourth tettares tetartos five fifth pente pemptos six sixth hex hektos seven seventh hepta hebdomos eight eighth okto ogdoös nine ninth ennea enatos ten tenth deka dekatos eleven eleventh hendeka hendekatos twelve twelfth dodeka dodekatos thirteen thirteenth triskaideka dekatotritos fourteen fourteenth tettareskaideka dekatotetartos fifteen fifteenth pentekaideka dekatopemptos sixteen sixteenth hekkaideka dekatohektos seventeen seventeenth heptakaideka dekatohebdomos eighteen eighteenth oktokaideka dekatoögdoös nineteen nineteenth enneakaideka dekatoënatos twenty twentieth eikosi eikostos twenty-one twenty-first heiskaieikosi eikostoprotos twenty-two twenty-second duokaieikosi eikostodeuteros twenty-three twenty-third triskaieikosi eikostotritos twenty-four twenty-fourth tetterakaieikosi eikostotetartos twenty-five twenty-fifth pentekaieikosi eikostopemptos twenty-six twenty-sixth hekkaieikosi eikostohektos twenty-seven twenty-seventh heptakaieikosi eikostohebdomos twenty-eight twenty-eighth oktokaieikosi eikostoögdoös twenty-nine twenty-ninth enneakaieikosi eikostoënatos thirty thirtieth triakonta triakostos thirty-one thirty-first heiskaitriakonta triakostoprotos forty fortieth tessarakonta tessarakostos fifty fiftieth pentekonta pentekostos sixty sixtieth hexekonta hexekostos seventy seventieth hebdomekonta hebdomekostos eighty eightieth ogdoëkonta ogdoëkostos ninety ninetieth enenekonta enenekostos hundred hundredth hekaton hekatostos hundred and ten hundred and tenth dekakaihekaton hekatostodekatos hundred and twenty hundred and twentieth ikosikaihekaton hekatostoikostos two hundred two hundredth diakosioi diakosiostos three hundred three hundredth triakosioi triakosiostos four hundred four hundredth tetrakosioi tetrakosiostos five hundred five hundredth pentakosioi pentakosiostos six hundred six hundredth hexakosioi hexakosiostos seven hundred seven hundredth heptakosioi heptakosiostos eight hundred eight hundredth oktakosioi oktakosiostos nine hundred nine hundredth enneakosioi enneakosiostos thousand thousandth chilioi chiliostos two thousand two thousandth dischilioi dischiliostos three thousand three thousandth trischilioi trischiliostos four thousand four thousandth tetrakischilioi tetrakischiliostos five thousand five thousandth pentakischilioi pentakischiliostos six thousand six thousandth hexakischilioi hexakischiliostos seven thousand seven thousandth heptakischilioi heptakischiliostos eight thousand eight thousandth oktakischilioi oktakischiliostos nine thousand nine thousandth enneakischilioi enneakischiliostos ten thousand ten thousandth myrioi myriastos twenty thousand twenty thousandth dismyrioi dismyriastos thirty thousand thirty thousandth trismyrioi trismyriastos forty thousand forty thousandth tetrakismyrioi tetrakismyriastos fifty thousand fifty thousandth pentakismyrioi pentakismyriastos sixty thousand sixty thousandth hexakismyrioi hexakismyriastos seventy thousand seventy thousandth heptakismyrioi heptakismyriastos eighty thousand eighty thousandth oktakismyrioi oktakismyriastos ninety thousand ninety thousandth enneakismyrioi enneakismyriastos hundred thousand hundred thousandth dekakismyrioi dekakismyriastos two hundred thousand two hundred thousandth ikosakismyrioi ikosakismyriastos three hundred thousand three hundred thousandth triakontakismyrioi triakontakismyriastos million millionth hekatontakismyrioi hekatontakismyriastos two million two millionth diakosakismyrioi diakosakismyriastos three million three millionth triakosakismyrioi triakosakismyriastos ten million ten millionth chiliakismyrioi chiliakismyriastos hundred million hundred millionth myriakismyrioi myriakismyriastos
Systematic polygon names To construct the name of a polygon with more than 20 and fewer than 100 edges, combine the prefixes as follows. The "kai" connector is not included by some authors.the system up to 999 is expressed with these prefixes; the names over 99 no longer correspond to how they are actually expressed in Greek.
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