You can put this solution on YOUR website! 3(90 - x) = 180 - x
270 - 3x = 180 - x
90 = 2x
45 degrees = x., the angle.
45 degrees + 45 degrees = 90 degrees, the complement.
3(45) = 135, the supplement.
135 degrees + 45 degrees = 180 degrees.
Cleomenius.