It is a nine sided figiure.
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There are very few real life examples of nonagons. The only examples that I can think of are a few coins.
A nonagon
Without any equality sign in the question then there is no equation to be considered but a nonagon is a 9 sided polygon.
The internal angles of a regular nonagon (a polygon having 9 sides) are obtuse angles of 140o.
Nonagon = 9 sides Hexagon = 6 sides So answer = 3