Identify Polygons by Number of Sides

from wikipedia:

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 Latin-Greek hybrid; neither is widely attested.
chiliagon	1000	Pronounced ), 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.

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