The 42 interior angles of a regular 42-agon add up to 7200 degrees and each angle is 7200/42 which is 171.'428571' degrees recurring decimal '428571'
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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
A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.