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Supplementary angles add up to 180 degrees
There is no such triangle with a sum of angles different that 180 degrees.
Yes they do add up to 180.
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.
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