Question

I already know the answer to angle 1, 2 and 3 but how do I find the angle for 4 and 5?

Answer 1

Angle 4:

angle 4 is 75º, since angle 4 plus 105º is a straight line (180º).

Angle 5:

Since angle 3 is 55, angle 4 is 75, and angles 3, 4, 5 make a triangle (180º), then angle 5 is 50º.