Contents 
Name  Edges  Remarks 

henagon (or monogon)  1  In the Euclidean plane, degenerates to a closed curve with a single vertex point on it. 
digon  2  In the Euclidean plane, degenerates to a closed curve with two vertex points on it. 
triangle (or trigon)  3  The simplest polygon which can exist in the Euclidean plane. 
quadrilateral (or quadrangle or tetragon)  4  The simplest polygon which can cross itself. 
pentagon  5  The simplest polygon which can exist as a regular star. A star pentagon is known as a pentagram or pentacle. 
hexagon  6  
heptagon  7  avoid "septagon" = Latin [sept] + Greek 
octagon  8  
enneagon (or nonagon)  9  
decagon  10  
hendecagon  11  avoid "undecagon" = Latin [un] + Greek 
dodecagon  12  avoid "duodecagon" = Latin [duo] + Greek 
tridecagon (or triskaidecagon)  13  
tetradecagon (or tetrakaidecagon)  14  
pentadecagon (or quindecagon or pentakaidecagon)  15  
hexadecagon (or hexakaidecagon)  16  
heptadecagon (or heptakaidecagon)  17  
octadecagon (or octakaidecagon)  18  
enneadecagon (or enneakaidecagon or nonadecagon)  19  
icosagon  20  
No established English name  100  "hectogon" is the Greek name (see hectometre), ."centagon" is a LatinGreek hybrid; neither is widely attested.^
^

chiliagon  1000  Pronounced /ˈkɪliəɡɒn/), this polygon has 1000 sides. The measure of each angle in a regular chiliagon is 179.64°.
René Descartes used the chiliagon and myriagon (see below) as examples in his Sixth meditation to demonstrate a distinction which he made between pure intellection and imagination. He cannot imagine all thousand sides [of the chiliagon], as he can for a triangle. However, he clearly understands what a chiliagon is, just as he understands what a triangle is, and he is able to distinguish it from a myriagon. Thus, he claims, the intellect is not dependent on imagination.^{[3]}

myriagon  10,000  See remarks on the chiliagon. 
megagon ^{[4]}  1,000,000  The internal angle of a regular megagon is 179.99964 degrees. 
Tens  and  Ones  final suffix  

kai  1  hena  gon  
20  icosi  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 
Ones  Tens  final suffix  

1  hen  10  deca  gon 
2  do  20  cosa  
3  tri  30  triaconta  
4  tetra  40  tetraconta  
5  penta  50  pentaconta  
6  hexa  60  hexaconta  
7  hepta  70  heptaconta  
8  octa  80  octaconta  
9  ennea (or nona)  90  enneaconta (or nonaconta) 
Ones  Tens  final suffix  full polygon name 

do  tetraconta  gon  dotetracontagon 
Tens  and  Ones  final suffix  full polygon name 

pentaconta  gon  pentacontagon 

Fundamental convex regular and uniform polytopes in dimensions 210  

n  nSimplex  nHypercube  nOrthoplex  nDemicube  1_{k2}  2_{k1}  k_{21}  
Family  A_{n}  BC_{n}  D_{n}  E_{n}  F_{4}  H_{n}  
Regular 2polytope  Triangle  Square  Pentagon  
Uniform 3polytope  Tetrahedron  Cube  Octahedron  Tetrahedron  Dodecahedron • Icosahedron  
Uniform 4polytope  5cell  Tesseract  16cell (Demitesseract)  24cell  120cell • 600cell  
Uniform 5polytope  5simplex  5cube  5orthoplex  5demicube  
Uniform 6polytope  6simplex  6cube  6orthoplex  6demicube  1_{22}  2_{21}  
Uniform 7polytope  7simplex  7cube  7orthoplex  7demicube  1_{32}  2_{31}  3_{21}  
Uniform 8polytope  8simplex  8cube  8orthoplex  8demicube  1_{42}  2_{41}  4_{21}  
Uniform 9polytope  9simplex  9cube  9orthoplex  9demicube  
Uniform 10polytope  10simplex  10cube  10orthoplex  10demicube  
Topics: Polytope families • Regular polytope • List of regular polytopes 
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Number
of sides.

3
Triangle.

4
Square.

5
Pentagon.

6
Hexagon.

7
Heptagon.

8
Octagon.

9
Nonagon.

10
Decagon.

11
Undecagon.

12
Dodecagon.

a

60°

90°

108°

1200

1284°

135°

140°

144°

1471i

150°

0

120°

90°

72°

60°

51'°

45°

40°

36°

321i°

30°

A

0.43301

I

1.72048

2.59808

3.63391

4.82843

6.18182

7.69421

9.36564

11.19615

R

0.57735

0.70710

0.85065

I

1.1523

1.3065

1.4619

I.6180

1.7747

1.9318

r

0.28867

0.5

0.688,9

0.86602

1.0383

1.2071

1.3737

1.5388

1.7028

1.8660

<< Polygnotus

Polygonaceae
>>

Categories: PLEPOL
A polygon is a closed twodimensional shape. It usually has three sides/corners or more. It could also be referred to as 'A closed plane figure bound by three or more line segments'. It has a number of edges. These edges are connected by lines. A square is a polygon because it has four sides. The smallest possible polygon in a Euclidean geometry or "flat geometry" is the triangle, but on a sphere, there can be a digon. The monogon is a theoretical figure that cannot exist  it has only one side and one edge.
If the edges (lines of the polygon) do not intersect (cross each other) , the polygon is called simple, otherwise it is complex.
In computer graphics, polygons (especially triangles) are often used to make graphics.
Simple
A simple concave hexagon 
Complex
A complex pentagon 
Polygon
How to make a face using polygons 
Here are sentences from other pages on Polygon, which are similar to those in the above article.
