∠ ACD is an exterior angle of ∆ ABC. If ∠ ACD = 110° and ∠ A = 60°, then ∠ B = ………………….. .
A. 50°
B. 60°
C. 70°
D. 55°
Answer:A
∠ ACD is an exterior angle of ∆ ABC. If ∠ ACD = 110° and ∠ A = 60°, then ∠ B = ………………….. .
A. 50° B. 60° C. 70° D. 55°