That would be a dodecagon? 12 sides? ((2 x 12) - 4) right angles = 1800o
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The 12 interior angles of a dodecagon add up to 1800 degrees
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.