The technique I use is add up the numbers in the ratio. You get 2 + 4 + 4 = 10. Now to find the angles, you have to find the fraction of each number in the triangle. So \(\frac{2}{10}\times 180 = 36\) . Since the other two angles are 4 and 4, which are two times of 2, we can say the other two angles are 72 degrees each.