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Let the biggest angle be x.therefore smallest angle=2x/3 we know sum of adjacent angles in parallelogram is 180. =>x+2x/3=180 =>x=108 now the smallest angle is 2x/3 =>2x108/3=72 therefore smallest angle=72

72 degrees let 1 angle be x then other adjacent angle will be 2/3x we know that sum of adjacent angles is 180 x + 2/3x = 180 x = 108 smallest angle will be 72 degrees