Answer:
a = b = 40°
Step-by-step explanation:
∠ a and 140° are adjacent and are supplementary , thus
a = 180° - 140° = 40°
a and b are alternate angles and are congruent, thus
b = a = 40°
b=40 okkkkllllllkkkkkkkkkkkkkkkkkkkkkllllllkkkk
