Hi

two angles are supplementary. 

the larger angle has measure three times as great as the measure of the smaller angle

Let x and 3x represent the measure of the smaller and larger angle

Question states***

 x + 3x = 180°

   4x = 180°

    x = 45°, the smaller angle



CHECKING our Answer*** 135° the larger angle (3*45°)

  45° + 135° = 180° 

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