We know that angle 3 is the same as angle 7. And we know that one line is equal to 180°. So we are going to take 180 and subtract 38 from it. Therefore, angle 3 is equal to 142°
I hope this helps. If you need anymore help, just ask.
∠3 = 142°
∠6 = 38° ( vertically opposite angles )
∠5 = 180 - 38 = 142° ( supplementary to ∠5 )
∠3 = 142° ( vertically opposite ∠5 )
