170 degrees
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The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.
135 Each interior angle of a regular octagon measures 135 degrees.
A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.
Each interior angle measures 144 degrees
The interior angle of an octdecagon, an 18 sided regular polygon, is 160o.