It has 90 but nobody other than a Greek or a pretentious snob would call it that.
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The sensible answer is a 90-gon. However, if you are pretentious or wish to obfuscate or irritate your audience you could go for enneacontagon.
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides
10 sides