Answer:
ithink its A miight be wrong tho hope it helps in someway ig idk
Step-by-step explanation:
m<A = 40
m<ACD = 100
m<B = 60
m<ACB = 180 - m<ACD
m<ACB = 180 - 100
m<ACB = 80
m<A = 180 - (60 + 80)
m<A = 180 - 140
