Shapes
This is a listing shapes with names determining by the number of angles and corners. Some of them have two names for it.





Geometry
----------------
Number of Sides

3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
30
40
50
60
70
80
90
100
10,000
Infinite (Circle)
Polygon

Trigon
Tetragon
Pentagon
Hexagon
Heptagon
Octagon
Enneagon
Decagon
Hendecagon
Dodecagon
Tridecagon
Tetradecagon
Pentadecagon
Hexadecagon
Heptadecagon
Octadecagon
Enneadecagon
Icosagon
Triacontagon
Tetracontagon
Pentacontagon
Hexacontagon
Heptacontagon
Octacontagon
Enneacontagon
Hectogon
Myriagon
Apeirogon
Another Name

Triangle
Quadrilateral


Septagon

Nonagon

Undecagon

Triskaidecagon
Tetrakaidecagon
Area

.43301sē
sē
1.72048sē
2.59808sē
3.63391sē
4.82832sē
6.18182sē
7.69421sē
9.36564sē
11.19615sē
Radius

.28868s~
.5s
.68819s
.86603s~
1.0383s
1.2071s
1.3737s
1.5388s
1.7028s
1.8660s
Apothem

.57735s
.70711s~
.85065s
s
1.1524s~
1.3066s~
1.4619s~
1.6180s~
1.7747s~
1.9319s~