The sum of the interior angles of any polygon is calculated by subtracting 2 from the number of sides and multiplying by 180: Interior Angles = (n-2)180 where n is the number of sides. Therefore: IA = (100-2)180 or IA = (98)180 or I = 17,640 degrees
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The sum of the interior angles is 360.
(number of sides-2)*180 = sum of the interior angles
The sum of the four interior angles of a trapezoid is 360 degrees.
The sum of the 4 interior angles of a trapezoid add up to 360 degrees.
-- 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.