How to solve and how to do the steps

You can find the measure of angle 2 by finding angle 1 which is 180-115=65 then 180-65= 115. You can also find angle 2 by supplementary angles which makes angle 2 equal to angle 4, which is 115deg. You can also go the other way and find angle 3 from 180-115=65deg then 180-65=115 for angle 2 again. Many ways to find the angle values.

Sorry i meant b in the other question