Each interior angle measures 1710 25' 42.86''
Each interior angle measures 162.'857142' degrees recurring '857142'
The sum of the interior angles of a 30-gon is (30-2)*180 = 5040 degrees. So each interior angle of a 30-gon is 5040/30 = 168 degrees.
Providing that it's a regular 54-gon then each interior angle measures 173 and a 1/3 degrees
Providing that it's a regular polygon then each interior angle measures 156 degrees
Each interior angle is 165 degrees
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Each interior angle measures 1710 25' 42.86''
It is 171 degrees
8100
157.5 degrees
179.9 degrees
170 degrees
168 degrees
152.31 degrees
Interior angle measure of a 18-gon = [180⁰(18 - 2)]/18 = 10⁰(16) = 160⁰. Exterior angle measure = 180⁰ - 160⁰ = 20⁰.