100 sides
Most mathematicians use "100-gon." Hectogon and centagon are also permissible.
Triangle, Quadrilateral, Pentagon, Hexagon, Heptagon, Octagon, Nonagon, Decagon are 3-10. After that, they are usually just referred to as 11-gon, 12-gon, etc., but there is a latin naming system. See related links.
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centagon
100 sides
hectogon or centagon
A 'Centagon'. from the Latin for 'hundred , which is 'Centus'.
Centagon
hectogon, centagon
hectogon, centagon
hectogon, centagon
hectogon, centagon
hectogon, centagon
hectogon, centagon