Types of 2D Polygon Shape Names with Sides and Pictures

Polygons are 2D shapes that have a certain number of sides. Their sides are simply joined by straight lines. Another thing to note is that polygons do not have holes, nor do they intersect with themselves. As for the number of sides, they could go on for infinity. 

Polygons with sides 1-10 such as triangle, square, pentagon, hexagon, heptagon, octagon, nonagon and decagon are well known but when number of sides get larger the naming becomes complicated and therefore, we follow a naming convention.

These all are regular polygons in which all angles are equal in measure and all sides have the same length. Regular polygons may be either convex or star. 

Let’s have a look at the list of all polygon names and know what they are called.

2D Polygon Shapes 1-100 with Sides and Pictures

Following is a list of polygons 1-100 and their names with the number of sides they have and an example picture.

Name of Polygon Number of Sides Picture
Trigon/ triangle Three – 3
Tetragon/ quadrilateral/ rectangle/ parallelogram/ square/ rhombus Four – 4 blank
Pentagon Five – 5 blank
Hexagon Six – 6 blank
Heptagon Seven – 7 blank
Octagon  Eight – 8 blank
Nonagon/enneagon Nine – 9 blank
Decagon  Ten – 10 blank
Hendecagon Eleven – 11 blank
Dodecagon Twelve – 12 blank
Triskaidecagon Thirteen – 13 blank
Tetradecagon  Fourteen – 14 blank
Pentadecagon  Fifteen – 15 blank
Hexadecagon  Sixteen – 16 blank
Heptadecagon  Seventeen – 17 blank
Octadecagon  Eighteen – 18 blank
Nonadecagon  Nineteen – 19 blank
Icosagon Twenty – 20 blank
Icosikaihenagon  Twenty one – 21 blank
Icosikaidigon  Twenty two – 22 blank
Icosikaitrigon  Twenty three – 23  blank
Icosikaitetragon Twenty four – 24 blank
Icosikaipentagon Twenty five – 25 blank
Icosikaihexagon Twenty six – 26 blank
Icosikaiheptagon Twenty seven – 27 blank
Icosikaioctagon Twenty eight – 28 blank
Icosikainonagon Twenty nine – 29 blank
Triacontagon Thirty – 30 blank
Triacontahenagon Thirty one – 31 blank
Triacontakaidigon Thirty two – 32 blank
Triacontakaitrigon Thirty three – 33 blank
Triacontakaitetragon Thirty four – 34 blank
Triacontakaipentagon Thirty five – 35 blank
Triacontakaihexagon Thirty six – 36 blank
Triacontakaiheptagon Thirty seven – 37 blank
Triacontakaioctagon Thirty eight – 38 blank
Triacontakainonagon Thirty nine – 39 blank
Tetracontagon Forty – 40 blank
Tetracontakaihenagon Forty one – 41 blank
Tetracontakaidigon Forty two – 42 blank
Tetracontakaitrigon Forty three – 43 blank
Tetracontakaitetragon Forty four – 44 blank
Tetracontakaipentagon Forty five – 45 blank
Tetracontakaihexagon Forty six – 46 blank
Tetracontakaiheptagon Forty seven – 47 blank
Tetracontakaioctagon Forty eight – 48 blank
Tetracontakainonagon Forty nine – 49 blank
Pentacontagon Fifty – 50 blank
Hexacontagon Sixty – 60 blank
Heptacontagon Seventy – 70 blank
Octacontagon Eighty – 80 blank
Nonacontagon Ninety – 90 blank
Nonacontakaihenagon Ninety one – 91 blank
Nonacontakaidigon Ninety two – 92 blank
Nonacontakaitrigon Ninety three – 93 blank
Nonacontakaitetragon Ninety four – 94 blank
Nonacontakaipentagon Ninety five – 95 blank
Nonacontakaihexagon Ninety six – 96 blank
Nonacontakaiheptagon Ninety seven – 97 blank
Nonacontakaioctagon Ninety eight – 98 blank
Nonacontakainonagon Ninety nine – 99 blank
Hectogon  One hundred – 100 blank
360-gon Three hundred and sixty – 360 blank
Chiliagon One thousand – 1000 blank
N-gon n blank

How to name a Polygon with N-sides?

As for their names, polygons have very straightforward names for the first ten or twenty names. They use a basic prefix naming system. Di, tri, tetra, penta, and so on. We are familiar with these prefixes as they are used in a variety of mathematical—and even scientific—subjects. But polygons with 21-99 sides have a different naming system. First, we use a prefix for the tens (such as triaconta—30). Then we use a prefix for the ones (such as di—20). At last, we put them together with a ‘kai’ between them. This would be formatted to look like (tens)kai(ones)gon. And for the sake of an example, we have (triaconta)kai(di)gon. In simpler words, a 32-sided polygon. We can normally refer to it as a 32-gon.

When you think of a polygon, you may think of basic shapes you may have learned of in school. A square, a rectangle—maybe even a parallelogram. But have you ever heard of a hectogon? What about a nonahectanonacontakaiheptagon? You probably might not have even read the whole word. This is the name for a polygon with 997 sides. Or, you could simply call it a 997-gon. This is how we classify the more complicated names. They are written as a variable: n-gon. You can replace the with any number you like!

Remember that polygons start at only three sides but can go on for infinity. There is no limit to how many sides a polygon can have! How cool is that?

Looking at the pictures, you may have also noticed that with every added side, the polygon starts to look more and more like a circle. How interesting is it to know that it would never quite become a perfect circle? 


Keep exploring EnglishBix to learn more about math vocabulary words for school kids.

Quick Links

  1. Geometry Vocabulary Words for Beginners
  2. Math Vocabulary Words for Kids
  3. Examples of Prefixes and Suffixes
  4. Circle Words with Meanings

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