If you wish to communicate information, I suggest you call it an 200-gon. Although there is a prefix for 200 (dihecta-) I suggest you keep it simple. Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary. Having said that, if you do want to be pretentious or obfuscate, you can use the link below for polygons with up to 999 sides. http://faculty.kutztown.edu/schaeffe/Tutorials/General/Polygons.html
it is called a seven sided shape in Canada
A 90 sided shape is called Enneacontagon.
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon
A 1000 sided shape is called a Chiliagon.
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200-gon.
Oh, dude, that's easy. A 200-sided shape is called a "dihectakaitetragon." Yeah, I know, it sounds like something out of a sci-fi movie, but hey, math can be weird like that. So next time you're doodling and accidentally draw a 200-sided shape, you can impress your friends by dropping that fancy term on them.
it is called a seven sided shape in Canada
The 22 sided shape is called a: ICOSIKAIDIGON
A 90 sided shape is called Enneacontagon.
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A seven sided shape is called a heptagon.
a 4 sided shape is called a quadrilateral
A 128-sided shape is called a hecatoicosioctagon.
An five sided shape is called a Pentagon