-- 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.
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A trapezoid.
2 opposite acute angles and 2 opposite obtuse angles with opposite parallel sides
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.