Hey! So to find angle b you’ll first subtract 95 by 180 which will find angle ADC.
180-95=85
Now we know that sum of all angles = 180. Hence—>
34+85+x=180
=85+x=180-34
=85+x=151
=x=151-85
X=66
Now to check our answer—> 66+34+85=180, Therefore we are right…
Angle b=66 degrees
Hope this makes sense :)
