The 12 interior angles of a dodecagon add up to 1800 degrees
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That would be a dodecagon? 12 sides? ((2 x 12) - 4) right angles = 1800o
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The sum of the angles in a nonagon total 1260 degrees.
The sum of the internal angles always equals 180o
The sum of the interior angles is 360.