Answer:
Step-by-step explanation:
65+3x-1=4+8x(the sum of two interior opposite angle are equal to the exterior angle formed)
64+3x=4+8x
64-4=8x-3x
60=5x
60/5=x
12=x
substitute the value of x
4+8x
4+8*12
4+96
100
therefore angle ZAB=100 degree
