The term "centgon" doesn't exist. The prefixes "centi" and "centa" stand for hundred or hundredth, but I've seen both centigon and centagon used for other things. The term for a hundred-sided shape is either hectogon or hectagon, although most mathematicians would use "100-gon."
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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
4 sides.