Before I start let me list the obvious down: All of the triangles angles equal to 180 degrees.
Let’s start with the first one: The angles are 29 and 105. So if the triangle equal to 180 degrees we have to add 29 and 105 and subtract from 108. 29 +105=134, 180-134=46.
Question 1= 46 degrees
So if you follow the same method for all the triangles you will get your answers.
I will show you how to do the second one: A straight line is also equal to 180 degrees so angle 1+2=180 degrees. To find the area of the triangle you will do 55+78 which equals 133. So to find angle 2 you do 180-133=47 but the question asks for angle 1. Si nce a straight line is 180 degrees you do 180-47=133
Question 2=133 degrees
For question 3 you would follow the same way as question 2.