154.29
14
N sides - 2(always)
12x180=2160
2160/14=154.285714~
which rounds up to 154.29
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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.
The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.
The interior angle of an octdecagon, an 18 sided regular polygon, is 160o.
A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.