The total of all angles in a triangle is 180.
For angle 1 we are given an angle of 39 and the other of 90 so the angle 1 is 51.
Also we are provided angle 1 plus 2 is 90 so the angle 2 is 90-51 which is 39.
Angle 4 can be found by 180-90- 39which is 51.
If 3 is 180- 39-51= 90
Angle 5 can be found by 180-90-34-39 =17
Angle 6 is 180-35-17=129
