Question 396810
  <pre><font size = 3 color = "indigo"><b>
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°