It is: (24-2)*180 = 3960 degrees
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The sum of the interior angles is 360.
The sum of the four interior angles of a trapezoid is 360 degrees.
(number of sides-2)*180 = sum of the interior angles
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.