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Regular Polygons

A "polygon" is a figure on a plane (2-dimensional — like a piece of paper) where all the sides are straight lines, and the lines connect to form a closed region. Here are a few polygons:

N-Sides	Name		Interior Angle
3	Triangle (or Trigon)		60°
4	Square (or Tetragon)		90°
5	Pentagon		108°
6	Hexagon		120°
7	Septagon		128.571°
8	Octagon		135°
9	Nonagon (or Enneagon)		140°
10	Decagon		144°
11	Hendecagon		147.273°
12	Dodecagon		150°
13	Triskaidecagon		152.308°
14	Tetrakaidecagon		154.286°
15	Pentadecagon		156°
16	Hexadecagon		157.500°
17	Heptadecagon		158.824°
18	Octadecagon		160°
19	Enneadecagon		161.053°
20	Icosagon		162°
30	Triacontagon		168°
40	Tetracontagon		171°
50	Pentacontagon		172.800°
60	Hexacontagon		174°
70	Heptacontagon		174.857°
80	Octacontagon		175.500°
90	Enneacontagon		176°
100	Hectagon		176.400°
1000	Chiliagon		179.640°
10000	Myriagon		179.964°
100000	Megagon		179.996°
10100	Googolgon		~180°
n	n-gon		(n-2) * 180 / n