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The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.
182
Because the 3 angles within a triangle add must up to 180 degrees and 2 right angles add up to 180 degrees
180 degrees
The sum of the interior angles is found by: (number of sides-2)*180 degrees Exterior angles add up to 360 degrees Angles on a straight line add up to 180 degrees