Hi

the second is 2 times the third

Let x and 2x represent the third and second angles respectively

question states***

72° + 2x + x = 180°

solving for x

     3x = 108°

      x = 36°, the second angle.  The third is 72°  (2*36°)



CHECKING our Anwer

  72° + 36° + 72° = 180° 

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