A [regular] hexagon.
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A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.
If the measure of an interior angle of a regular polygon is 140o, the polygon is a nonagon (sometimes called an ennagon) having 9 sides.
It will have 8 sides and it is called a regular octagon.
interior angle of an n-sided polygon = (180(n-2)/n)°interior angle of a 24-sided polygon = (180x22/24)° = 165°