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4,320° is.
90 x (2 x 15 - 4) ie 90 x 26 = 2340o. The sum of the interior angles of an n-sided polygon always is 90 x (2n - 4) degrees
Each exterior angle is 360/26 = 13.846 degrees approx. So each interior angle = 180-13.846 = 166.154 degrees (approx).
If it's a regular 28-agon then each interior angle is: (26*180)/28 = 167.'142857' degrees recurring decimals 0.'142857'
(26-2)*180 = 4320 degrees