For the first figure a triangle must all add up to 180 degrees so just do
180-60 which gives you 120
For the second one it is the same 104+ 22 = 126 then you do 180-126 which gives you 54
For the 3rd figure that straight line is equal to 180 so you do 180-154 which gives you 26 and because the other angle is a right angle we know it adds up to 90. 90+26 = 116 then finally you do 180 - 116 which gives you 64.
