List of polygons Last updated August 07, 2025
A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In 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 of the edges meet are the polygon's vertices (singular: vertex) or corners .
The word polygon comes from Late Latin polygōnum (a noun), from Greek πολύγωνον (polygōnon/polugōnon ), noun use of neuter of πολύγωνος (polygōnos/polugōnos , the masculine adjective), meaning "many-angled". Individual polygons are named (and sometimes classified) 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.
Greek numbers Polygons are primarily named by prefixes from Ancient Greek numbers.
English-Greek numbers [ 1] [ 2] English cardinal number English ordinal number Greek cardinal number Greek ordinal number one first heis (fem. mia, neut. hen ) 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.
Tens and Ones final suffix -kai- 1 -hena- -gon 20 icosi- (icosa- when used alone) 2 -di- 30 triaconta- 3 -tri- 40 tetraconta- 4 -tetra- 50 pentaconta- 5 -penta- 60 hexaconta- 6 -hexa- 70 heptaconta- 7 -hepta- 80 octaconta- 8 -octa- 90 enneaconta- 9 -ennea-
Extending the system up to 999 is expressed with these prefixes. [ 3]
Polygon names Ones Tens Twenties Thirties+ Hundreds 10 deca- 20 icosa- 30 triaconta- 1 hena- 11 hendeca- 21 icosi-hena- 31 triaconta-hena- 100 hecta- 2 di- 12 dodeca- 22 icosi-di- 32 triaconta-di- 200 dihecta- 3 tri- 13 triskaideca- 23 icosi-tri- 33 triaconta-tri- 300 trihecta- 4 tetra- 14 tetrakaideca- 24 icosi-tetra- 40 tetraconta- 400 tetrahecta- 5 penta- 15 pentakaideca- 25 icosi-penta- 50 pentaconta- 500 pentahecta- 6 hexa- 16 hexakaideca- 26 icosi-hexa- 60 hexaconta- 600 hexahecta- 7 hepta- 17 heptakaideca- 27 icosi-hepta- 70 heptaconta- 700 heptahecta- 8 octa- 18 octakaideca- 28 icosi-octa- 80 octaconta- 800 octahecta- 9 ennea- 19 enneakaideca- 29 icosi-ennea- 90 enneaconta- 900 enneahecta-
List of n-gons by Greek numerical prefixes List of n-gon names [ 4] [ 5] Sides Names 1 henagon monogon 2 digon bigon 3 trigon triangle 4 tetragon quadrilateral 5 pentagon 6 hexagon 7 heptagon septagon 8 octagon 9 enneagon nonagon 10 decagon 11 hendecagon undecagon 12 dodecagon 13 tridecagon triskaidecagon 14 tetradecagon tetrakaidecagon 15 pentadecagon pentakaidecagon 16 hexadecagon hexakaidecagon 17 heptadecagon heptakaidecagon septendecagon 18 octadecagon octakaidecagon 19 enneadecagon enneakaidecagon 20 icosagon 21 icosikaihenagon icosihenagon 22 icosikaidigon icosidigon icosadigon 23 icosikaitrigon icositrigon icosatrigon 24 icosikaitetragon icositetragon icosatetragon 25 icosikaipentagon icosipentagon icosapentagon 26 icosikaihexagon icosihexagon icosahexagon 27 icosikaiheptagon icosiheptagon icosaheptagon 28 icosikaioctagon icosioctagon icosaoctagon 29 icosikaienneagon icosienneagon icosaenneagon 30 triacontagon 31 triacontakaihenagon triacontahenagon tricontahenagon 32 triacontakaidigon triacontadigon tricontadigon 33 triacontakaitrigon triacontatrigon tricontatrigon 34 triacontakaitetragon triacontatetragon tricontatetragon 35 triacontakaipentagon triacontapentagon tricontapentagon 36 triacontakaihexagon triacontahexagon tricontahexagon 37 triacontakaiheptagon triacontaheptagon tricontaheptagon 38 triacontakaioctagon triacontaoctagon tricontaoctagon 39 triacontakaienneagon triacontaenneagon tricontaenneagon 40 tetracontagon tessaracontagon 41 tetracontakaihenagon tetracontahenagon tessaracontahenagon 42 tetracontakaidigon tetracontadigon tessaracontadigon 43 tetracontakaitrigon tetracontatrigon tessaracontatrigon 44 tetracontakaitetragon tetracontatetragon tessaracontatetragon 45 tetracontakaipentagon tetracontapentagon tessaracontapentagon 46 tetracontakaihexagon tetracontahexagon tessaracontahexagon 47 tetracontakaiheptagon tetracontaheptagon tessaracontaheptagon 48 tetracontakaioctagon tetracontaoctagon tessaracontaoctagon 49 tetracontakaienneagon tetracontaenneagon tessaracontaenneagon 50 pentacontagon pentecontagon 51 pentacontakaihenagon pentacontahenagon pentecontahenagon 52 pentacontakaidigon pentacontadigon pentecontadigon 53 pentacontakaitrigon pentacontatrigon pentecontatrigon 54 pentacontakaitetragon pentacontatetragon pentecontatetragon 55 pentacontakaipentagon pentacontapentagon pentecontapentagon 56 pentacontakaihexagon pentacontahexagon pentecontahexagon 57 pentacontakaiheptagon pentacontaheptagon pentecontaheptagon 58 pentacontakaioctagon pentacontaoctagon pentecontaoctagon 59 pentacontakaienneagon pentacontaenneagon pentecontaenneagon 60 hexacontagon hexecontagon 61 hexacontakaihenagon hexacontahenagon hexecontahenagon 62 hexacontakaidigon hexacontadigon hexecontadigon 63 hexacontakaitrigon hexacontatrigon hexecontatrigon 64 hexacontakaitetragon hexacontatetragon hexecontatetragon 65 hexacontakaipentagon hexacontapentagon hexecontapentagon 66 hexacontakaihexagon hexacontahexagon hexecontahexagon 67 hexacontakaiheptagon hexacontaheptagon hexecontaheptagon 68 hexacontakaioctagon hexacontaoctagon hexecontaoctagon 69 hexacontakaienneagon hexacontaenneagon hexecontaenneagon 70 heptacontagon hebdomecontagon 71 heptacontakaihenagon heptacontahenagon hebdomecontahenagon 72 heptacontakaidigon heptacontadigon hebdomecontadigon 73 heptacontakaitrigon heptacontatrigon hebdomecontatrigon 74 heptacontakaitetragon heptacontatetragon hebdomecontatetragon 75 heptacontakaipentagon heptacontapentagon hebdomecontapentagon 76 heptacontakaihexagon heptacontahexagon hebdomecontahexagon 77 heptacontakaiheptagon heptacontaheptagon hebdomecontaheptagon 78 heptacontakaioctagon heptacontaoctagon hebdomecontaoctagon 79 heptacontakaienneagon heptacontaenneagon hebdomecontaenneagon 80 octacontagon ogdoecontagon 81 octacontakaihenagon octacontahenagon ogdoecontahenagon 82 octacontakaidigon octacontadigon ogdoecontadigon 83 octacontakaitrigon octacontatrigon ogdoecontatrigon 84 octacontakaitetragon octacontatetragon ogdoecontatetragon 85 octacontakaipentagon octacontapentagon ogdoecontapentagon 86 octacontakaihexagon octacontahexagon ogdoecontahexagon 87 octacontakaiheptagon octacontaheptagon ogdoecontaheptagon 88 octacontakaioctagon octacontaoctagon ogdoecontaoctagon 89 octacontakaienneagon octacontaenneagon ogdoecontaenneagon 90 enneacontagon enenecontagon 91 enneacontakaihenagon enneacontahenagon enenecontahenagon 92 enneacontakaidigon enneacontadigon enenecontadigon 93 enneacontakaitrigon enneacontatrigon enenecontatrigon 94 enneacontakaitetragon enneacontatetragon enenecontatetragon 95 enneacontakaipentagon enneacontapentagon enenecontapentagon 96 enneacontakaihexagon enneacontahexagon enenecontahexagon 97 enneacontakaiheptagon enneacontaheptagon enenecontaheptagon 98 enneacontakaioctagon enneacontaoctagon enenecontaoctagon 99 enneacontakaienneagon enneacontaenneagon enenecontaenneagon 100 hectogon hecatontagon hecatogon 120 hecatonicosagon dodecacontagon 200 dihectagon diacosigon 300 trihectagon triacosigon 400 tetrahectagon tetracosigon 500 pentahectagon pentacosigon 600 hexahectagon hexacosigon 700 heptahectagon heptacosigon 800 octahectagon octacosigon 900 enneahectagon enneacosigon chiliagon dischiliagon dichiliagon trischiliagon trichiliagon tetrakischiliagon tetrachiliagon pentakischiliagon pentachiliagon hexakischiliagon hexachiliagon heptakischiliagon heptachiliagon octakischiliagon octachiliagon enneakischiliagon enneachilliagon 000 myriagon 000 dismyriagon dimyriagon 000 trismyriagon trimyriagon 000 tetrakismyriagon tetramyriagon 000 pentakismyriagon pentamyriagon 000 hexakismyriagon hexamyriagon 000 heptakismyriagon heptamyriagon 000 octakismyriagon octamyriagon 000 enneakismyriagon enneamyriagon 000 decakismyriagon decamyriagon 000 icosakismyriagon icosamyriagon 000 triacontakismyriagon tricontamyriagon 000 tetracontakismyriagon tetracontamyriagon 000 pentacontakismyriagon pentacontamyriagon 000 hexacontakismyriagon hexacontamyriagon 000 heptacontakismyriagon heptacontamyriagon 000 octacontakismyriagon octacontamyriagon 000 enneacontakismyriagon enneacontamyriagon 000 000 hecatontakismyriagon megagon 000 000 diacosakismyriagon dimegagon 000 000 triacosakismyriagon trimegagon 000 000 tetracosakismyriagon tetramegagon 000 000 pentacosakismyriagon pentamegagon 000 000 hexacosakismyriagon hexamegagon 000 000 heptacosakismyriagon heptamegagon 000 000 octacosakismyriagon octamegagon 000 000 enneacosakismyriagon enneamegagon 000 000 chiliakismyriagon decamegagon 000 000 dischiliakismyriagon icosamegagon 000 000 trischiliakismyriagon triacontamegagon 000 000 tetrakischiliakismyriagon tetracontamegagon 000 000 pentakischiliakismyriagon pentacontamegagon 000 000 hexakischiliakismyriagon hexacontamegagon 000 000 heptakischiliakismyriagon heptacontamegagon 000 000 octakischiliakismyriagon octacontamegagon 000 000 enneakischiliakismyriagon enneacontamegagon 000 000 myriakismyriagon hectamegagon 000 000 000 gigagon [ 6] ∞ apeirogon
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