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Total interior angles: (100-2)*180 = 17,640 degrees
a right angle is 90 degrees. 100% of the time.
360 degrees
If A and B are the angles, then A + B = 180 and A - B = 20 So that 2A = 200 ie A = 100 and then B = 80 So the two angles are 100 and 80 degrees.
A straight line in angles represents 180 degrees.