Providing that it's a regular 54-gon then each interior angle measures 173 and a 1/3 degrees
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165.6
Each interior angle measures 1710 25' 42.86''
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.
Each interior angle measures 162.'857142' degrees recurring '857142'
Providing that it's a regular polygon then each interior angle measures 156 degrees