Question 388303
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Hi,         
Let x, 2x and 6x represent the smallest angles and larger two angles respectively
question states***
  x + 2x + 6x = 180°
solving for x
          9x = 180°
           x = 20°, the smallest, the others 40° and 120°

CHECKING our Answer
  20° + 40° + 120° = 180°