List of Polygons - wikipedia List of Polygons A pentagon is a five sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In geometry, a polygon / ˈpɒlɪɡɒn / 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 or circuit. These segments are called its edges or sides, and the points where two 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. Contents 1 Greek numbers 2 Systematic polygon names 3 List of n - gons by Greek numerical prefixes 4 See also 5 References Greek numbers Polygons are primarily named by prefixes from Greek numbers. English - Greek numbers 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 - - hena - - gon 20 icosi - ( icosa - when alone ) - di - 30 triaconta - - tri - 40 tetraconta - - 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. Polygon names Ones Tens Twenties Thirties+ Hundreds 10 deca - 20 icosa - 30 triaconta - 100 hecta - hena - 11 hendeca - 21 icosi - hena - 31 triaconta - hena - 200 dihecta - di - 12 dodeca - 22 icosi - di - 32 triaconta - di - 300 trihecta - tri - 13 triskaideca - 23 icosi - tri - 33 triaconta - tri - 400 tetrahecta - tetra - 14 tetrakaideca - 24 icosi - tetra - 40 tetraconta - 500 pentahecta - 5 penta - 15 pentakaideca - 25 icosi - penta - 50 pentaconta - 600 hexahecta - 6 hexa - 16 hexakaideca - 26 icosi - hexa - 60 hexaconta - 700 heptahecta - 7 hepta - 17 heptakaideca - 27 icosi - hepta - 70 heptaconta - 800 octahecta - 8 octa - 18 octakaideca - 28 icosi - octa - 80 octaconta - 900 enneahecta - 9 ennea - 19 enneakaideca - 29 icosi - ennea - 90 enneaconta - List of n - gons by Greek numerical prefixes List of n - gon names Sides Names monogon henagon digon trigon triangle tetragon quadrilateral 5 pentagon 6 hexagon 7 heptagon septagon 8 octagon 9 enneagon nonagon 10 decagon 11 hendecagon undecagon 12 dodecagon 13 trisdecagon tridecagon 14 tetradecagon 15 pentadecagon pentedecagon 16 hexadecagon hexdecagon 17 heptadecagon 18 octadecagon 19 enneadecagon 20 icosagon 21 icosikaihenagon icosihenagon icosaisagon 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 tricontaisagon 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 42 tetracontakaidigon tetracontadigon 43 tetracontakaitrigon tetracontatrigon 44 tetracontakaitetragon tetracontatetragon 45 tetracontakaipentagon tetracontapentagon 46 tetracontakaihexagon tetracontahexagon 47 tetracontakaiheptagon tetracontaheptagon 48 tetracontakaioctagon tetracontaoctagon 49 tetracontakaienneagon tetracontaenneagon 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 200 dihectagon diacosigon 300 trihectagon triacosigon 400 tetrahectagon tetracosigon 500 pentahectagon pentacosigon 600 hexahectagon hexacosigon 700 heptahectagon heptacosigon 800 octahectagon octacosigon 900 enneahectagon enacosigon 7003100000000000000 ♠ 1000 chiliagon 7003200000000000000 ♠ 2000 dischiliagon 7003300000000000000 ♠ 3000 trischiliagon 7003400000000000000 ♠ 4000 tetrakischiliagon 7003500000000000000 ♠ 5000 pentakischiliagon 7003600000000000000 ♠ 6000 hexakischiliagon 7003700000000000000 ♠ 7000 heptakischiliagon 7003800000000000000 ♠ 8000 octakischiliagon 7003900000000000000 ♠ 9000 enakischiliagon 7004100000000000000 ♠ 10 000 myriagon 7006100000000000000 ♠ 1000000 megagon ∞ apeirogon See also Platonic solid Dice References Jump up ^ `` Greek and Latin words for numbers ''. AWE. Hull University. Jump up ^ Lozac'h, N. ( 1983 ). `` Extension of Rules A-1.1 and A-2.5 Concerning Numerical Terms used in Organic Chemical Nomenclature '' ( PDF ). iupac.org. International Union of Pure and Applied Chemistry. Jump up ^ `` Naming Polygons and Polyhedra ''. The Math Forum. Drexel University. Jump up ^ `` Naming Polygons ''. The Math Forum. Drexel University. NAMING POLYGONS Benjamin Franklin Finkel, A Mathematical Solution Book Containing Systematic Solutions to Many of the Most Difficult Problems, 1888 Polygons Special cases, including regular polygons with their own names, in parentheses List of polygons by number of sides 1 -- 10 sides Monogon Digon Triangle Equilateral Isosceles Quadrilateral Square Rectangle Rhombus Parallelogram Trapezoid Kite Pentagon Hexagon Heptagon Octagon Nonagon ( Enneagon ) Decagon 11 -- 20 sides Hendecagon Dodecagon Tridecagon Tetradecagon Pentadecagon Hexadecagon Heptadecagon Octadecagon Enneadecagon Icosagon 21 -- 100 sides ( selected ) Icositetragon ( 24 ) Triacontagon ( 30 ) Triacontadigon ( 32 ) Triacontatetragon ( 34 ) Tetracontagon ( 40 ) Tetracontadigon ( 42 ) Tetracontaoctagon ( 48 ) Pentacontagon ( 50 ) Hexacontagon ( 60 ) Hexacontatetragon ( 64 ) Heptacontagon ( 70 ) Octacontagon ( 80 ) Enneacontagon ( 90 ) Enneacontahexagon ( 96 ) Hectogon ( 100 ) > 100 sides 120 - gon 257 - gon 360 - gon Chiliagon ( 1,000 ) Myriagon ( 10,000 ) 65537 - gon Megagon ( 1,000,000 ) Apeirogon ( ∞ ) Star polygons ( 5 -- 12 sides ) Pentagram Hexagram Heptagram Octagram Enneagram Decagram Hendecagram Dodecagram Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_polygons&oldid=825371118 '' Categories : Polygons Mathematics - related lists Talk Contents About Wikipedia Русский Edit links This page was last edited on 13 February 2018, at 00 : 52. 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Question: what do you call a 9 sided polygon
Answer: nonagon